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Anand_Narayana
Anand_Narayana
Explorer
July 17, 2014
Question

Unable to connect fortissl vpn

  • July 17, 2014
  • 4 replies
  • 155817 views
Hi, I have a peculiar problem while trying to connect using fortissl vpn client. The firewall firmware is v5.0,build3608 (GA Patch 7). When I am trying to connect using the fortissl vpn client (ver. 4.0.2250), I get the message " Unable to establish the vpn connection. The vpn server may be unreachable (-5)" . I have no issue accessing the portal on port 10443. The page gets loaded from my laptop confirming port is not restricted, but it does not connect only i am trying to connect using the ssl vpn client. Parallely, when I try to connect another location firewall (v4.0,build0346,120606 (MR2 Patch 12)) I have no issues as i am able to connect using the same fortissl vpn client. Any ideas as what could cause such issues. There are other clients, who connect to the same firewall (v5.0,build3608 (GA Patch 7)) and using the same fortissl client (ver. 4.0.2250), they have no issues connect to it.

    4 replies

    Warren_Olson_FTNT
    Staff
    Warren_Olson_FTNT
    Staff
    July 17, 2014
    Possibly you' ve already checked this but try disabling Windows Firewall and any other AV/Malware products you have running to ensure they' re not blocking access to that uncommon port.
    djwilliams
    djwilliams
    New Member
    July 21, 2014
    Assuming you are using the lite client, have you tried to specify the port in the Server Address: field? The full client provides a field to specify the port you are using for sslvpn. The lite client doesn' t have that field so I have to specify https://vpn.somedomain.com:10443. Hopefully it is that simple.
    Anand_Narayana
    Anand_NarayanaAuthor
    Explorer
    July 21, 2014
    Hi, The issue has been resolved. Root Cause: After the firmware upgrade to 5.0.7, it is mandate that the client' s Internet Explorer' s version should be abloe 7.0. Soon after the IE update, it starting connecting.
    wladimirszczerban
    wladimirszczerban
    New Member
    March 21, 2019

    i had had the same problem this worked 

    Nihas
    Nihas
    New Member
    July 25, 2014
    A new lesson.. Thanks!
    noize88
    noize88
    New Member
    June 5, 2017

    Today i faced same problem, v5.6.0 build1449 (GA), Windows 10 PRO 64bit (7 Pro), FortiClient 5.4.3.0870

    Some of VPN users cannot connect to SSL VPN, getting "Unable to establish the vpn connection. The vpn server may be unreachable".

    Any ideas? 

    SSL VPN tunnel was working fine from the start 2-3 month stable.

    I've got ident. PC with same configuration and connecting to tunnel without any problems. (Internet Explorer settings ident.)

     

    Tried:

    Turn Off Firewall

    Turn Off Antivirus

    Restore Fortigate backup to date when all was working, but i have same error, so i guess its not Fortigate side.

    hdez503
    hdez503
    New Member
    June 20, 2017

    Hello everyone

     

    Recently I had the same issue with FortiClient 5.4.3.0870 and it was fixed enabling the following options inside of Control Panel/Internet Options/Advanced Options:

     

    - Use SSL 2.0

    - Use SSL 3.0

    - Use TLS 1.0

    - Use TLS 1.1

    - Use TLS 1.2

     

    Regards!

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