The VPN server is not reachable.

[shcee0]

The connection settings are the same, but some pc output a message that the VPN server is unreachable.

In this case, if I proceed with network initialization. It's been connected before, but this happens all of a sudden. What is the problem and what is the solution?

[xshkurti]

@shcee0 

The problem is that VPN server is not reachable.

What is causing the problem is not very clear. Can you please elaborate what vpn server are you using, what vpn client, what PC OS, a simple network diagram would be helpful.

What FortiGate model are you using, do you have a stable internet connectivity?

[shcee0]

sure

fortigate 200E sslvpn

forti client 7.0.5.0238

Win 10~11

No internet issue

[dsrivastava]

Hi,
Could you please provide below details:
-Are you using user authentication to connect through SSL VPN?
-At what percentage vpn connection fails on Forticlient?
-Is 'Host Check' option is enabled in SSL-VPN configuration on the FortiGate?
-Can you attach the error screenshot?

[shcee0]

- yes user auth

- under 50%

- no host check option

i dont know upload image, this is error.

VPN connection failed. The VPN server is not reachable. (-8)

[ndumaj]

Hello,
Do you use Local/LDAP/Radius users?
Did you tried throw the web ssl?
FNBAMD and SSLVPN should provide more info:
https://community.fortinet.com/t5/FortiGate/Technical-Tip-FortiGate-debug-SSL-VPN-daemon/ta-p/214433
Run teh following commands on FGT CLI:

diag debug console timestamp enable

diag debug app fnbamd -1

diag debug app sslvpn -1

diag debug enable

BR

[MoisesArturo]

I encountered an unexpected issue while attempting to connect to my company's VPN using a FortiClient software. Up until now, the connection has been smooth and reliable, but suddenly, I started receiving an error message stating, "SSL VPN cannot connect to the server." I have verified my internet connectivity, and other colleagues are successfully accessing the VPN, so the issue seems to be specific to my setup. I have checked my firewall settings and ensured that the FortiClient application has the necessary exceptions.

[ndumaj]

Hello,

Are you connecting from Home or internal LAN of company.
Check Routing address configuration.
Put your subnet into the Routing Address option.
Did you tried from SSL web mode? Do you face the same issue?
BR

[knaveenkumar]

Hi,

Can you ping  ssl vpn ip and check are you able to ping or not.

Can you able to do telnet for the ssl vpn port no 

Also, can you please refer the below documents for ssl vpn debug and provide the output.

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-SSL-VPN-Troubleshooting/ta-p/189542

-naveen 

[parteeksharma]

Hi shcee0,

As per the error message you received "The VPN server is not reachable" please check below link and try to use the workaround to fix the issue:

https://community.fortinet.com/t5/FortiGate/Technical-Tip-The-VPN-server-may-be-unreachable-20199/ta...


Regards,

Parteek