Site shown as Unknown and disconnected from the VLR (SRM) plugin.
Error: "Unable to retrieve pairs from extension server at Unable to login to 'Site Recovery Manager Server at"
VMware Live Site Recovery 9.X
An unprivileged account login to VLR can restrict in sites getting connected to procced with further actions.
Make sure the user has adequate SRM administrator level access or one must use SSO administrator level access to continue operation.
Refer VLR user roles under Link