How to fix GNS3 Errors Connecting to Server

In GNS3 Network Simulator, when we drag and drop some devices like Router, an error issued. The error is ” Could not connect to on port 8000: [WinError 10061] No connection could be made because the target machine actively refused it “.

Connecting to Server

It is not happened always but some time, maybe in the first start of GNS3 or sometime else refused by Anti viruses or Firewall software.

How to Fix GNS3 Errors

Unfortunately it is not only on Windows Operating system but I saw this error in Linux also.

How to fix GNS3 Errors on Windows?

So to fix the problem in Windows system, just run the GNS3 as Administrator and continue your work. Now it must work correctly. If it’s not solved your GNS3 problems, just let us know and find out how to fix GNS3 errors

Connecting to ServerGNS3GNS3 ErrorHow to FixNetworkingport 8000Simulator
Comments (43)
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  • vidhun sahayaraj


    I tried as run as administrator, but I am facing same problem

    • Shais

      Once clear and install the latest GNS3 v1.2.3.

  • karar

    This is an Superb solution for this problam!

  • adnan

    good for those who need to fix gns3 errors. I need IOS Images

  • sakhisafari

    This is very good website, it solve this GNS3 problam.
    thank you

  • Al

    Hi ,
    just upgraded to ‘Running GNS3 version 1.3.7.dev1 on Windows (64-bit)’, but since installation I get the Subject message. I have tried disabling the firewall and A/Virus (windows f/w turned off), I have checked the kaspersky F/W and it shows port 8000 is ‘active’. I have also tried changing server ports to other ports vice 8000 and also tried running GNS3 as admin but none of this has worked. When I had v1.2.3 loaded it all worked as advertised. All I have done is re-installed over the top of the previous version and have now deleted the installed version and wiped with an powerful uninstaller and re-installed….to no avail. Still getting the subject message. When I drop in router I get the following..’ Error while creating project: Can’t connect to server‘ which is kind of expected, but just trying to give full details

  • Nam

    i’m tried but it’s not change

  • Emmanuel

    I install the latest GNS3 each time i tried to run a Router by dragging i received the error below. I really need help.
    Server error from ESW1: Lost communication with :[WinError 64] The specified network name is no longer available, Dynamips process running: True

    • Shais

      The current version of GNS3 is 1.4.0b4 and fixed lots of GNS3 errors. Once try to install it.
      If it doesn’t work, test another IOS and set pretty enough RAM for router ios.

  • Nilesh

    I am getting issue.
    “Server error from ESW1: Lost communication with :[WinError 64] The specified network name is no longer available, Dynamips process running: True”

    Please help!

    • Shais

      The current version of GNS3 is 1.4.0b4 and fixed lots of GNS3 errors. Once try to install it. If it doesn’t work, test another IOS and set pretty enough RAM for router ios.

      I’m not pretty sure about this error, but once turn off AV and Windows firewall.

  • Nilesh

    I have also tried this (GNS3 is 1.4.0b4) new version also but showing same error.

    • Shais

      It is relevant to your system. Try to test with another system if it is possible.

  • dading1234

    I have tried 0.8.7&1.3.11,both have the problem Server error from ESW1: Lost communication with :[WinError 64] The specified network name is no longer available, Dynamips process running: True”. i have tried to change the system but also dont work

    • Shais

      Thanks, your article is great.

  • Raja

    Simple but very effective…. Its working and the problem solved.

    Thank You mate ..



    • Shais

      Your welcome Raja,
      Thanks for comment

  • Hasbi

    Please help me, how to slove it : Server error from Mikrotik Web: Attachment (hostonly) already configured on adapter 1. Please set it to ‘Not attached’ to allow GNS3 to use it. thank’s

  • DeviPrasad

    turn off anti virus and firewall in your PC & run as administrator will solve the problem

  • Jhon Fredy

    To fix it, just run the windowas task manager, then go to detils and look for a GNS3 procces, closed it. That´s all.

    • Shais

      It just close the current process, you must run it again.

  • Scott

    gns3 1.4.4 nothing works. av and firewall turned off, run as admin, actively refused.

  • Kyle L.

    Just fixed this problem a few minutes ago on my windows machine.
    1) I ran netstat -a to see what ports are being listened on. I had a number of ports for in the listening state (in this case 8307)
    2) I changed the local port under Edit –>Preferences –> Server; where there is the host binding option.
    3) Make sure it’s under or any other interface you choose
    4) Change the port to one of the ports listed as listening in your netstat -a output from the cmd window.
    5) Ensure your path to gns3.exe is correct and it should work.

    • Shais

      Thanks Kyle L.

  • Bhanu Pratap Mahato

    Added GNS3 folder in AVG Antivirus exception list.

  • modarn

    the problem on port in gns3 4
    i cannot fix it even i delete the avg and i do start with admin way and i did to change the the port of on edit and it does not work

  • ydoucare

    So… Download the GNS.VM and run it on vmware … that will work, here are the links:

    once you´ve installed it the VPCS device will work, in order to run the IOS… better get the image and run it on your PC instead, specify the directory you have the image on by going under preferences> Dynamips> IOS images.. and voila!! you are welcome.

  • Keyboardbanger

    Thanks for the tip but GNS3 keeps crashing on my machine, on Windows.

  • Daniel

    I currently use AVG Antivirus and resolved this issue permanently by adding an exception for Dynamips.exe.

    Disable AVG, then:
    Open AVG, Options, Advance Settings, Exceptions, (Browse to GNS3, Dynamips) add dynamips.exe.

    You can then enable AVG.

  • SC

    Thanks – it worked

  • whoe

    is here anybody?why this damn problem is still **** me….i have no Antivirus,firewall down,win10 64bit,god damn….i have done everything….anybody …save me….

  • kadernjoya

    iam learning cisco associate ihave face the same pb mine was not working because of the antivirus AVG when i UNINSTALL IT GNS3 start working normally

  • Chuck

    Can anyone help me please. Same problem, How can i run as Administrator ?

    • Shais

      Right click the GNS3 and run as administrator.

  • Del

    I had this same problem. It was my Anti-virus program (AVG)

    Uninstalled it and now it fine. Reinstalling now I know the cause and will create a few rules.

  • Abdel-hameed Hashem

    Timeout request Error while getting compute list: Operation timeout. This kind of appears as i drag a router to the blank page
    P.S I am not using a v.m , I am using images
    Thanks in advance.

  • ben

    I have the same problem and don’t know what to do. It starts fine and in the middle of configruation it drops out and I get the network disabled error 3080

  • ben

    By the way I turned off my AntiVirus

  • Christopher P. Glaydor

    thanks kyle L. Says your solution just solved my problem.

  • Leonardo

    Hi Shais,
    I write about GNS3 VM connection problem.
    icon GNs3 VM is grey instead icon local server is green.

    i’ve installed on my system Lenovo Windows 10 Pro, GNS3 2.1.12 and on the Vmware Workstation 15 GNS3 VM 0.10.14.
    GNS3 VM turn on proprely the Workstation Player when I open GNS3 as Administrator privilege.
    Firewall is turned off.
    Edit –>Prefernces –>Server

    host binding
    Port 3080 TCP

    Thank you very much

  • zahid akhoon

    This error is caused by windows firewall. To Resolve issue you need to stop the firewall. Asides that you can try to Reinstall gns3. Here is a video with step by step instructions on how to install gns3.

  • Clement

    Copy and past into your brower and hit enter
    this will open the hyper link associated to that ip.
    in my case it was splunk. you will have to uninstall any service using that ip for GNS3 to work.