ERROR 31: VPN Client : The certificate associated with this Connection Entry no longer exists or failed to open.Please select another certificate.


Problem 

ERROR 31: The certificate associated with this Connection Entry no longer exists or failed to open.Please select another certificate. 

upon trying to connect through VPN.

Cause 

The certificate doesn't exist or failed to open.

Possible resolution

If you have installed a new certificate and removed the old one, you need to enroll the new certificate.

Either delete the previous connection entry and create new or modify the certificate authentication entry for existing entry.

Go to connection entries ->  Right click the respective connection entry -> Click Modify

Within certificate authentication section , select the new installed certificate.