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Anzine321's avatar
Anzine321
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Sep 19, 2024

tunnel failed after antivirus avg from trial to full protection

Hi

i have issue that tunnel failed after avg antivirus from trial to full protection

here is log on f5 report user

CHostCtrl::Failed, Firing OnError event (message: Failed to initialize local Tunnel Server)

 

 

  • On the Windows edge client, tunnelserver is the process that handles comms between winsock and the VPN network driver. It implements TLS/SSL, F5 FastPPP, PPP, LCP, iSession, and a few other things and serves as the primary "TCP to PPP proxy". This allows the F5 VPN driver to be much simpler (more secure) because it doesn't have to do much besides just talk PPP and FastPPP.

    In a who-talk-to-whom diagram, it might look something like this:  

    Network -> Windows -> Winsock -> Tunnelserver -> F5 VPN NDIS Driver -> Windows Network

     

    From a tech support perspective, tunnelserver does a lot of stuff. It has OpenSSL in it and does a lot of network stuff so it is sometimes terminated or prevented from operation by antimalware / antivirus software, or firewall software. You can typically add processes and executable files to an "allow list" in AV software, so make sure you've done that.

     

    This is an example of the kind of thing that happens with interop against some AV software vendors:
    https://my.f5.com/manage/s/article/K10893

     

    • Anzine321's avatar
      Anzine321
      Icon for Altocumulus rankAltocumulus

      Hi

      Thanks for information

      processes and executable files to an "allow list" in AV software is TunnelServer.exe ?

      i will explore Av antivirus setting how to add allow list

      based on your article that workaround is remove the TunnelServer.exe file from the antivirus quarantine or remove the F5 Networks Dynamic Application Tunnel Control client component