I'm facing one issue I'm unable to add one client server in core dashboard.Its giving following error:-
Value cannot be null. Parameter name:Source
Can anyone please help me out.Support team is telling to upgrade the Core version form 6.2 to 6.3
Agent version is 6.2
Agent OS:-windows 2012 R2 Standard
Core OS:-windows server 2012 Standard
WARN 2019-11-21T08:13:10  - Replay.Agent.Management.Authentication.AgentPairingClientCertificateAuthenticator ()
Request client certificate thumbprint 'C355AEFC0649A62C83326737770F64F8DE428EFD' does not match previously paired client certificate thumbprint ''