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rsmayer
rsmayer
New Member
October 28, 2014
Question

Forticlient VPN - Hangs on "Connecting" on first attempt.

  • October 28, 2014
  • 3 replies
  • 56711 views

This affects various versions from 5.0.7 through 5.2.1 (at least).

Our Fortigate VPN server is current 5.0.9.

 

Frequently, the first (at least) to establish a VPN connects hangs when connecting.   If you then disconnect, most often the second an subsequent attempts succeed.     Our user community's patience in dealing with this inconvenience is fading.  

Here is quote from one user..  " I’ve had this recurring issue with the FCL VPN, despite all the configuration changes over time, where I cannot connect on the first try. I can immediately connect on the second try. I have tried a variety of scenarios (rebooting, not-rebooting, trying different networks, disabling IPV6 etc, disabling security services like EMET) and none of these things have any effect on the result."

 

We have deployed several different VPN profiles - some used mode config and other use DHCP over ipsec.   The problem seems worse with the DHCP profiles, but does occur with the others as well.   Any suggested on a possible cause?

Thanks

Rich Mayer

mayer@lgsinnovations.com

 

    3 replies

    Chris_Lin_FTNT
    Staff
    Chris_Lin_FTNT
    Staff
    October 29, 2014

    It's hard to tell by only reading your description. But if you look at FortiGate debug log, it will probably show you what was going on.

      stpalme
      stpalme
      New Member
      August 10, 2016

      Same Problem here over years, kind of frustrating. From forticient 4.3 to 5.4, fortios running on the 100D 5.0x to 5.28. Setup is IPSEC VPN with certificates. Different WAN links on the fortigate, different client connection over DSL or mobile networks, no difference. According to the logfile it happens already after the first phase 1 message, Client log says "negotiate_error No response from the peer, phase1 retransmit reaches maximum count..." vpntunnel=XXX vpntype=ipsec". Second attempt works at almost 90%. 

      Chris_Lin_FTNT
      Staff
      Chris_Lin_FTNT
      Staff
      August 10, 2016

      In the log files (from FortiClient and FortiGate), do you see any certificate verification failed or any other error?

        jhonyspark
        jhonyspark
        New Member
        June 10, 2021

        The problem is that fortclient 6.0 inst compatible with your SO.  Just download an older verson of fortclient, and the problem will be solved.

         

        Maerre
        Maerre
        Explorer III
        May 23, 2025

        Hello,

         

        i need to resume this post because in 2025 i still have the same problem even with Forticlient version 7.4.0.1658.
        The 1st attempt to login always fails even the credential are correct, the 2nd attempt indeed, works correctly.

        What can be? I didn't find any fix on official documentation or posts.

         

        Thank you

        Regards

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