Following blog has been written by Deepak Mittal, Support Escalation Engineer, EMEA TFS Team
Unable to configure/verify a TFS Connection in Release Management client.
Error message: Invalid length for a Base-64 char array or string.
This issue may occur due to user does not have enough permissions on the machine.
This problem seems to be because there are some missing information in the database – PublicKey. This PublicKey should have been added to the database during installation of the RM Server.
It the PublicKey is missing for user with which you are trying to configure release management, that means something wrong happened during the installation. One thing is for some reason,the account doing the installation was missing some permissions.
Note: Also if the issue is with the user, then password textbox in the configuration will not get fill with dots.
Written by: Deepak Mittal, Support Escalation Engineer
Reviewed by: Romit Gulati, Support Escalation Engineer