This article describes how to rectify 'failed to establish the VPN connection', '5029 error'.
While connecting the FortiClient the below-mentioned error can appear.
(settings) # sh fulNow, select the TLS 1.1 and TLS 1.0 on client machine end or change the TLS version to 1.2 on FortiGate end will be needed.
# config vpn ssl settings
set reqclientcert disable
set ssl-max-proto-ver tls1-1
set ssl-min-proto-ver tls1-0
If all step here has been followed by still getting same error to connect, make sure to check
the server certificate are set and not empty. This can be verify under SSL-VPN Setting -> Server
Certificate. Please change it accordingly.
After certificate has been set, it will be possible to connect to SSL-VPN.
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