Hi
@PhilipDAth,
I'll ask our server team to double check but there was nothing that jumped out last time. We do have the Symantec AV client installed on all of the DC's, all running the same policy but some happily respond and others don't, but not consistently. MX1 might get a response from DC1 but MX2 doesn't.
I'm not 100% certain how to confirm the certificates but is one MX works and another doesn't, I would have thought the certificate was OK.
I'm just finding it difficult to find a pattern to be able to poke something with a stick.