Unable to connect error -455 on windows server 2019

[akhanjer]

Hello ,

the below  error appear when try to connecting to VPN on window server 2019 :

FortiClient 

[Anthony_E]

Hello akhanjer,

Thank you for using the Community Forum.

I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Regards,

[Anthony_E]

Hello,

I have found this old forum post:

https://community.fortinet.com/t5/Fortinet-Forum/Impossible-to-connect-to-VPN-Permission-denied-455/...

Apparently, this erros is indicating a credential issue.

You can check some replies, the solution is surely in.

If not, come back to us and we will try to find another solution.

Best regards,

[akhanjer]

Hello Anthony,

 kindly note that same error # -455 but different message please check the attached image 

[Anthony_E]

Oh Ok.

We will will continue to find a solution then.

Regards,

[ac1]

OS control is probably enabled in the FortiGate configuration.
Check from: SSL-VPN Portals -> Restrict to a specific OS version

[akhanjer]

Hi ,

how I can access VPN Portals please check my setting

 

[ac1]

VPN Portals are located on FortiGate and not on FortiClient. If you do not have direct access you must make this request to the FortiGate manager.
I don't think the setting on FortiGate is manageable so if you want to connect you should have it deactivated.

[Markus_M]

Host check is a sort of filter from the VPN server, the FortiGate. There is a policy that does not allow you for some reason. The client either has to comply to the policy or the policy has to be adapted on the server.

The client cannot circumvent the server policy.

Best regards,

Markus

[Emma]

This error means your device cannot connect to your provider's mail server. It can be anything from no network, intermittent or unstable network, or even a good internet connection in general but inability to reach your specific provider's mail server.