FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
dbhavsar
Staff
Staff
Article Id 232404
Description

This article explains how to fix an issue where the FortiClient stops loading at 31% and displays the error 'Unable to establish VPN connection. The VPN server may be unreachable (-6005)'.

Scope FortiClient V6.0 and above.
Solution

Screenshot of the error:

 

dbhavsar_0-1670340225302.png

 

This error may occur with Two-Factor Authentication after accepting the token code or after entering the answer to a security question. The time limit reaches 0 while authenticating, triggering this error.

 

To fix it, increase the remote authentication timer with the following CLI commands:

 

# config system global

set remoteauthtimeout 60

end

 

'60' is a recommended value which will give 120 seconds for the authentication process to complete. The default is 5. Use any desired and suitable value.

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