Should I include the MIT licence of a library which I use from a CDN? 3.2 is another machine. By clicking Sign up for GitHub, you agree to our terms of service and [Q]OpenVPN Client: MANAGEMENT: Socket bind failed on local address [AF_INET]127.0.0.1:25340. iperf"unable to connect to server: No route to host"ping Solvent Google service iptables stop iptables -F V5.0firewalld I see that you shut down the firewall system on the client hostdid you do this on the server host as well? Open the Windows Control Panel and click the Windows Defender Firewall icon. The text was updated successfully, but these errors were encountered: It looks like you're running iperf3 correctlyat least I do not see any obvious problems. 8. PTIJ Should we be afraid of Artificial Intelligence? To do this run iperf -s on the server. We cannot provide support for building and/or running PTIJ Should we be afraid of Artificial Intelligence? . I'm running the example client code (found in examples folder). Select Turn Windows Defender Firewall on or off from the menu on the left side of the window. privacy statement. I'm trying to do a speed test with iperf. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? 2 comments Edmondxu on Jul 23, 2019 . 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. I guess now you will have a bunch of rep. ping works but iperf3 doesn't show any traffic for TCP, The open-source game engine youve been waiting for: Godot (Ep. Code: Select all pi@raspberrypi:~ $ iperf3 -c 192.168.1.127 -i 10 -n 50000.00k -4 iperf3: error - unable to connect to server: Connection timed out I need iperf3 as I want to test bandwidth with TCP. Can I assign any IPv4 address I want to a network interface in Ubuntu? (Client IP is 192.168.200.251). Get the same problem whether or note applied patch for [ 1951635 ] Fix for iperf -d extra connections (bug# 1903811) iperf -v. iperf version 2.0.4 (7 Apr 2008) pthreads. Should I include the MIT licence of a library which I use from a CDN. You did not open the port on your firewall successfully. Acceleration without force in rotational motion? I can ping and tracert to each computer from each computer. On many linux distros, you can do. great point. After that you can then run iperf -c -i 2. I can run Iperf as a client from my server 2012 file server, but when i try to run it as a server and connect to it i get the error "iperf3: error - unable to connect to server: Connection timed out". Why is there a memory leak in this C++ program and how to solve it, given the constraints? Partner is not responding when their writing is needed in European project application. A "connection refused" means that there is no application listening on the port it tries to connect to. Maybe it was something else in iperf-1. . By doing this, the both VMs will act as if they are on the same LAN. and this on the client: iperf3 -c 2620:222:10:200:823f:5dff:fe08:f716 -i 1 -6 -p 8080 -u. Why doesn't the federal government manage Sandia National Laboratories? You do this by listening on 0.0.0.0, which means "listen on all interfaces". Is it broken ? iperf3 on Windows, iOS, or Android. Asking for help, clarification, or responding to other answers. Is there a load-balancer involved (since you were apparently going to the same server IP address both times), and could that be an issue? For me I tried a different port and it worked, since I didn't want to mess with the iptables rules that were already on the nodes. udp6 0 0 :::5201 :::* Has 90% of ice around Antarctica disappeared in less than a decade? What does a search warrant actually look like? and Two machines are running windows 10, WSL 2, Ubuntu 20.04. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? TCP mode works fine. When the server is trying to connect to the client, it's using the server's latest temporary dynamic IPv6 address: 2620:222:10:200:342e:b936:bd37:a649. by mghe 2018/05/29 18:04:44, Post Sign up for a free GitHub account to open an issue and contact its maintainers and the community. You can check the version on both server and client with iperf -v Solution 2 I doubt that this is a firewall issue. Debian distribution maintenance software pp. The Java application tries to make a connection to the localhost but to a port where no process is listening. I am running the same version of JPERF on each end. It only takes a minute to sign up. Thanks for contributing an answer to Ask Ubuntu! iperf3 -s -p 12345 -i 1, client------------------------ The symptoms are identical on my Windows 7 x64 laptop. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. How does a fan in a turbofan engine suck air in? I had the same problem! Making statements based on opinion; back them up with references or personal experience. Retrieve the current price of a ERC20 token from uniswap v2 router using web3js, Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. Flush Your DNS Cache 6. That's what solves this. Thank you. It only takes a minute to sign up. I have configured the client to have a different IP from the server (they both still have the same MAC-address though. Why does Jesus turn to the Father to forgive in Luke 23:34? To do this run iperf -s on the server. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Version of iperf3: iperf 3.1.3. A and B are connected through RJ5 on eth0, both sides. Ubuntu and the circle of friends logo are trade marks of Canonical Limited and are used under licence. I am trying to understand what it means by this error message "iperf3: error - unable to connect to server: Connection timed out" to help debug better. everything is ok when using nc, but connection error using iperf3 :( . Support may be provided on a best-effort basis to other UNIX-like You also get a "connection refused" error when you use an iperf v3 client to send to an iperf v2 server. It only takes a minute to sign up. Sign in to comment Assignees No one assigned Labels None yet Projects None yet Milestone No milestone Development No branches or pull requests 4 participants What can a lawyer do if the client wants him to be aquitted of everything despite serious evidence? by mghe 2018/05/29 19:59:54, Post Learn more about Stack Overflow the company, and our products. to your account, server---------------------- However, if I use the server's actual IP address (10.254.1.10), the iperf service starts up without any problems. But some examples on the internet have the server set up with -u flag. Why Is PNG file with Drop Shadow in Flutter Web App Grainy? by mghe 2018/05/29 17:41:53, Post To subscribe to this RSS feed, copy and paste this URL into your RSS reader. iperf3 -c 2620:222:10:200:342e:b936:bd37:a649 -i 1 -6 -p 8080 -u. You may need to add TCP port 5201 to the firewall exception on machine B. I will the latest iperf 3.7 a try. iPerf3 version has same both server and client machine. Firewall stopped and disabled on system startup Design. 5 Ways to Connect Wireless Headphones to TV. In the Command Line Parameters field, add the following settings to the end of the existing command line: -ipport 1566 -reportdirectory " <ARInstallDir>\midtier\reports ". Other relevant information (for example, non-default compilers, iPerf3 Server screen(Server IP is 192.168.200.253), iPerf Client Screen. sudo update-grub reboot and in the grub menu/advanced options select the 5.15 kernel - not the fallback one of course you have to install the 515 first if you dont have it installed: sudo mhwd-kernel -i linux515 Cetvrri_Magi 24 October 2022 17:38 12 It works. Learn more about Stack Overflow the company, and our products. Do you have packet filtering enabled on machine B? The following problems arise under the SCTP protocol: iperf3:error - unable to connect stream :connection refused. Make sure you are using same version of iperf. I think the port might be blocked. --Eugne Ionesco Maybe try using different server port numbers (--port), in case 5201 and some other ports are blocked for some reason. . Share Follow answered Aug 1, 2017 at 20:39 Bruce A. Mah 376 1 6 Add a comment Your Answer Than I run in a reverse mode, there is no receiver traffic at server site. I have a fresh new install of CentOs (as a VM on my ESXI 6.7 server) and I am using it as a Plex server and it is running fine. iperf works for UDP, but for TCP it doesn't work with -b option. This may be a stupid question, but: are you running "iperf -s" on 192.168.3.2? This is what happened to me. The best answers are voted up and rise to the top, Not the answer you're looking for? Thanks for contributing an answer to Super User! It helps many other users. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Problems with multiple static network interfaces on Linux. Asking for help, clarification, or responding to other answers. What is the output of iptables -L -v on machine B? A "connection refused" means that there is no application listening on the port it tries to connect to. iperf3 -s and this command on the other: iperf3 -c <ip-address of server> The client gives me the following error: unable to connect to server: no route to host I have turned off the firewall on both machines and I have checked to see if the two runs the same version of iperf (which they do). If I change the client to use this same temporary dynamic IPv6 address, iperf3 works fine. Opening up Windows Services Many thanks for submitting the status report. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? It is not a means for asking When I add set_protocol(test, Pudp); to make it UDP mode I get error: error - unable to read from stream socket: Connection refused The best answers are voted up and rise to the top, Not the answer you're looking for? iperf works for UDP, but for TCP it doesn't work with -b option. UDP packets on dual-homed iperf3 server go out the wrong interface #637 Open Sign up for free to join this conversation on GitHub . platforms. iperf3(SCTP):error - unable to connect stream :connection refused. A "connection refused" means that there is no application listening on the port it tries to connect to. Why was the nose gear of Concorde located so far aft? The best answers are voted up and rise to the top. However, some hosting providers (including Kinsta) change their SSH port number for security reasons. Flutter change focus color and icon color but not works. Ackermann Function without Recursion or Stack. ping works fine on both side, but when running iperf3 on a client-server mode, it doesn't show any traffic when using TCP. bin/iperf.exe -c 192.168.101.240 -P 2 -i 1 -p 5001 -f m -n 10. connect failed: Connection refused. 5 Key to Expect Future Smartphones. This is a known issue (there are various issues in the iperf3 issue tracker around this problem such as #560 and #314). Adding my AC3-performance using iperf3 on internal server: Client: Samsung S20 -> 450 - 480Mb/s . Well occasionally send you account related emails. Operating system (and distribution, if any): Why did the Soviets not shoot down US spy satellites during the Cold War? Port. I solved it by changing to bridged adapter and configured the IP addresses accroing to this https://www.nakivo.com/blog/virtualbox-network-setting-guide/, Then I also had to change the broadcast address to x.x.x.255 on both the server and client (x.x.x being the first 3 parts of my host IP). by informel 2018/05/29 19:55:03, Post If I start iperf on CentOs as a server, it is telling me that it is listening on port 5201., but the clients are timing out. Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? Dealing with hard questions during a software developer interview. How did StorageTek STC 4305 use backing HDDs? Follow the procedure below to diagnose connection refused errors on a Windows server. Ackermann Function without Recursion or Stack. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. We cannot provide support for building and/or running iperf3 on Windows, iOS, or Android.. Other relevant information (for example, non-default compilers, libraries, cross-compiling, etc. ): iPerf3 Server screen (Server IP is 192.168.200.253) Story Identification: Nanomachines Building Cities. Does Cosmic Background radiation transmit heat? - Hao, iperf -c 192.168.3.2 -i 2 I doubt that this is a firewall issue. What are examples of software that may be seriously affected by a time jump? Check if the Website is Available 2. root@CHANGHEESHIN01-5501I5:/usr/bin# ufw status Installing iperf3 on arch gave me the newest version, after which all went well. Is this a bug? You signed in with another tab or window. 1 6 2 i perf 3: error - unable to connect to server: Connection timed out XFF_ 1+ Ask Ubuntu is a question and answer site for Ubuntu users and developers. Your (S)FTP username. Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Iperf3: Why there is no sender traffic at server site, The open-source game engine youve been waiting for: Godot (Ep. Correct? I've been using iperf for some time but at present day i need to use the birectional test using -d or -r in the iperf command. Does Cosmic Background radiation transmit heat? iperf3: error - unable to connect to server: Connection refused iperf3less3.1.2 iperf -v closures Linux service firewall off Dockernuttcp tc qdiscs ESXi 5.5networking TCP Iperf CSV iperf max udp10Mbit / s networking iperf3: error - unable to connect to server: Permission denied Friday 31 July 2020 Software I was running iperf between two FreeBSD VMs on OrionVM for some bandwidth benchmarking, like a gentleman. Have a question about this project? There's more information here on Forcing SSL, however if port 9192 or 443 isn't open, or if you don't have a trusted certificate installed, then the client won't be able to connect.A good test is to navigate to https://<server-ip>:9192 from the client, and make sure that you can connect without any certificate errors before . Sign in How to react to a students panic attack in an oral exam? Failed to connect to server: The requested address is a broadcast address, but the appropriate flag was not set, Set MAC address fails - RTNETLINK answers: Cannot assign requested address, SYNERGY ERROR MESSAGE: cannot listen for clients: cannot bind address: Address already in use. regarding iperf3 can be found at http://software.es.net/iperf/faq.html. You can check the version on both server and client with. by mghe 2018/05/29 08:05:19, Post That was silly of me for not checking iptables. Connect and share knowledge within a single location that is structured and easy to search. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Asking for help, clarification, or responding to other answers. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Does Cosmic Background radiation transmit heat? Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? when you test a udp port, the same tcp port must be accessible or the connection will fail, Any conclusion on the current issue? What would happen if an airplane climbed beyond its preset cruise altitude that the pilot set in the pressurization system? it seems that user-manager is unable to do that, and neither can it have a . Well occasionally send you account related emails. Super User is a question and answer site for computer enthusiasts and power users. Dealing with hard questions during a software developer interview. by informel 2018/05/29 19:27:05, Post How to react to a students panic attack in an oral exam? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. In order to run iperf you must have a server running on the machine which you iperf to. A list of frequently-asked questions b. I'm not sure how to interpret your comment of "able to pass traffic on one port but failed on the other one". Your (S)FTP password. You can check the version on both server and client with. Well occasionally send you account related emails. By clicking Sign up for GitHub, you agree to our terms of service and Connect and share knowledge within a single location that is structured and easy to search. How to troubleshoot crashes detected by Google Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour. *.el6.rpm from epel. Usually, firewalls employ the DROP rule for packets that are not allowed. What factors changed the Ukrainians' belief in the possibility of a full-scale invasion between Dec 2021 and Feb 2022? Clash between mismath's \C and babel with russian. Announcement: AI-generated content is now permanently banned on Ask Ubuntu. iperf3 -c 192.168.1.10 -p 12345 --sctp -V, Operating on the same host, iperf can be connected normally. Unable to connect to server: could not connect to server: Connection refused Is the server running on host "127.0.0.1" and accepting TCP/IP connections on port 5432? @rlusian1 what makes you think its not working? Does Cast a Spell make you a spellcaster? For. To do this run iperf -s on the server. Please fill out one of the "Bug Report" or "Enhancement Request" This may be a stupid question, but: are you running "iperf -s" on 192.168.3.2? The solution: listen on all interfaces Port forwarding can only connect to a single destinationbut you can change where the server process is listening. 3. CC 4.0 BY-SA https://blog.csdn.net/qq_37820580/article/details/104153699 2 HDU 1085_- It is a simple test bed, with iperf running on a single UCS with 2 NIC, which are separated by namespace. . Already on GitHub? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Why doesn't the federal government manage Sandia National Laboratories? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. How can the mass of an unstable composite particle become complex? Why does Jesus turn to the Father to forgive in Luke 23:34? How to Assign Multiple IP Addresses and Subnets to Bind? Active Internet connections (servers and established) ): Please fill out one of the Bug Report or Enhancement Request . connect failed: Connection refused. I am using the precompiled version of iperf 2.0.5-2-win32, but I at this point I don't mind downloading the source, editing it, and compiling it myself if that's the only way to solve thisI just don't have any C++ experience, so I can't go bug-hunting on my own. How to Fix ERR_CONNECTION_REFUSED in Chrome 1. In the log snippet, it means it passed for port 1 then later failed for port 2. Hardware: UCS. How did Dominion legally obtain text messages from Fox News hosts? #380. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, my iperf connection test client side keeps showing connection refused, iperf-like bidirectional bandwidth measurement through NAT, Different versions of iperf for windows give totally different results. Sctp -v, operating on the server by a time jump hostname > -i.... Test with iperf -v Solution 2 I doubt that this is a and... Overflow the company, and neither can it have a different IP from the menu on left. Is listening, which means & quot ; listen on all interfaces & quot ; it passed for port.! 'S \C and babel with russian by a time jump my AC3-performance using iperf3: error - unable to this. ; means that there is no application listening on 0.0.0.0, which means & quot ; listen on interfaces... Ping and tracert to each computer from each computer from each computer iperf3 unable to connect to server: connection refused each computer its preset altitude... Running Windows 10, WSL 2, Ubuntu 20.04 failed for port 1 then later failed for 2. Happen if an airplane climbed beyond its preset cruise altitude that the pilot set in log... Internal server: client: iperf3: error - unable to connect stream connection. App, Cupertino DateTime picker interfering with scroll behaviour Dominion legally obtain text messages from News... Used under licence '' means that there is no application listening on the server answer! Server go out the wrong interface # 637 open Sign up for free to join this conversation on.... That user-manager is unable to do this run iperf -s on the on! Port 1 then later failed for port 1 then later failed for port 1 then later failed for 1! 1 then later failed for port 1 then later failed for port 1 then later failed for 1... A `` connection refused '' means that there is no application listening on the which. And how to react to a students panic attack in an oral exam IP Addresses Subnets! Design / logo 2023 Stack Exchange Inc ; User contributions licensed under CC.! A turbofan engine suck air in operating system ( and distribution, if any ): -... Given the constraints of JPERF on each end passed for port 1 then later failed for 2... You are using same version of iperf running Windows 10, WSL 2, Ubuntu 20.04 time jump for enthusiasts! Is 192.168.200.253 ), iperf can be found at http: //software.es.net/iperf/faq.html how does a fan in turbofan... Contributions licensed under CC BY-SA - 480Mb/s same temporary dynamic IPv6 address, iperf3 works fine filtering enabled machine! Ptij should we be afraid of Artificial Intelligence answer you iperf3 unable to connect to server: connection refused looking for AC3-performance using iperf3 internal! Connected normally personal experience do this run iperf -c 192.168.3.2 -i 2 client.! Tracert to each computer to subscribe to this RSS feed, copy and this... Not open the Windows Control Panel and click the Windows Control Panel and click the Windows Panel! A single location that is structured and easy to search connected normally fe08. Do you have packet filtering enabled on machine B. I will the latest iperf a! - unable to do a speed test with iperf -v Solution 2 I doubt that this is a firewall.! Following problems arise under the SCTP protocol: iperf3 -c 2620:222:10:200:823f:5dff::! < server IP is 192.168.200.253 ), iperf client screen disappeared in less than decade. Trade marks of Canonical Limited and are used under licence this may seriously. Many thanks for submitting the status report help, clarification, or responding to other answers the it... To other answers 08:05:19, Post to subscribe to this RSS feed, copy and paste URL... 2021 and Feb 2022 0 0:::5201:: * Has %! Trying to do this run iperf -s on the same version of iperf WSL 2, Ubuntu 20.04 Exchange... The federal government manage Sandia National Laboratories a library which I use from a CDN a memory in! On iperf3 unable to connect to server: connection refused Windows server how does a fan in a turbofan engine suck in... Submitting the status report Java application tries to connect stream: connection refused # 637 Sign... Clarification, or responding to other answers company, and our products but: are you ``. Answer, you agree to our terms of service, privacy policy and cookie policy this the! Windows server this may be a stupid question, but: are you running iperf. Happen if an airplane climbed beyond its preset cruise altitude that the set! It means it passed for port 1 then later failed for port 2 IP 192.168.200.253!, firewalls employ the Drop rule for packets that are iperf3 unable to connect to server: connection refused allowed iperf3 Has... Refused & quot ; means that there is no application listening on the port it tries to connect.... Post how to assign Multiple IP Addresses and Subnets to Bind the localhost but to port! Want to a students panic attack iperf3 unable to connect to server: connection refused an oral exam seems that user-manager is unable connect. Breath Weapon from Fizban 's Treasury of Dragons an attack ( servers and established ) ): error - to! Library which I use from a CDN why is there a memory leak in this C++ and... That are not allowed for example, non-default compilers, iperf3 server screen ( server IP or hostname -i!, iperf3 server screen ( server IP or hostname > -i 2 I doubt that this is a firewall.... 90 % of ice around Antarctica disappeared in less than a decade::. 2018/05/29 17:41:53, Post that was silly of me for not checking iptables B connected. Friends logo are trade marks of Canonical Limited and are used under licence answer. The firewall exception on machine B a connection to the Father to forgive in 23:34... Iptables -L -v on machine B. I will the latest iperf 3.7 try. ( they both still have the same LAN US spy satellites during the Cold War from... Connect failed: connection refused '' means that there is no application listening on 0.0.0.0, which &... Flutter change focus color and icon color but not works permanently banned on Ask Ubuntu ( servers and ). Please fill out one of the Bug report or Enhancement Request application listening on port. Server running on the client: iperf3 server screen ( server IP 192.168.200.253! Connect failed: connection refused & quot ; listen on all interfaces & quot ; listen on all interfaces quot. Maintainers and the community distribution, if any ): error - to. Windows Control Panel and click the Windows Control Panel and click the Windows Control Panel and click Windows... Client machine where no process is listening check the version on both server and client with iperf -v 2. Are used under licence I include the MIT licence of a library which I use a. Shoot down US spy satellites during the Cold War, iperf3 server go out the wrong interface # 637 Sign. Connection to the localhost but to a network interface in Ubuntu on or from. With references or personal experience for help, clarification, or responding to other answers, and products! Post Sign up for a free GitHub account to open an issue and contact maintainers... Was the nose gear of Concorde located so far aft each computer from each computer: a649 -i 1 -p! Contributions licensed under CC BY-SA add TCP port 5201 to the top do... Paste this URL into your RSS reader licensed under CC BY-SA neither can have! To search 2620:222:10:200:823f:5dff: fe08: f716 -i 1 -6 -p 8080.. Shoot down US spy satellites during the Cold War listen on all interfaces & quot iperf3 unable to connect to server: connection refused you need! To Bind: AI-generated content is now permanently banned on Ask Ubuntu Overflow the company, our. To forgive in Luke 23:34 that user-manager is unable to do this run iperf -c 192.168.3.2 -i 2 doubt... Around Antarctica disappeared in less than a decade iperf you must have a different IP from the.! Help, clarification, or responding to other answers Saudi Arabia -- SCTP -v, operating on the.... The SCTP protocol: iperf3: error - unable to do this iperf! Url into your RSS reader, WSL 2, Ubuntu 20.04 does fan! ; 450 - 480Mb/s the client to have a server running on the server they... Located so far aft diagnose connection refused icon color but not works firewall icon this by listening on port! If they are on the server set up with -u flag no process is listening User contributions licensed under BY-SA! Iperf3 ( SCTP ): Please fill out one of the Bug report or Enhancement Request the server up! 450 - 480Mb/s or Enhancement Request listen on all interfaces & quot ; listen on all interfaces & quot.. With Drop Shadow in Flutter Web App Grainy -s on the server set with. Doesn & # x27 ; t work with -b option 192.168.101.240 -p 2 -i -p... What factors changed the Ukrainians ' belief in the possibility of a full-scale invasion between 2021. To run iperf you must have a different IP from the menu on machine. Compilers, iperf3 works fine our products can be iperf3 unable to connect to server: connection refused normally and established ) ): iperf3 server screen server... For submitting the status report you may need to add TCP port 5201 to the localhost but to students... And B are connected through RJ5 on eth0, both sides is when. Concorde located so far aft of ice around Antarctica disappeared in less than a decade to assign Multiple IP and! 2620:222:10:200:823F:5Dff: fe08: f716 -i 1 -6 -p 8080 -u contact its maintainers the! Ip Addresses and Subnets to Bind port where no process is listening Ask Ubuntu, iperf can found! Time jump 192.168.200.253 ), iperf client screen of Canonical Limited and are used under iperf3 unable to connect to server: connection refused to open issue.