Domino Remote Console Issue

We have 3 Domino servers running OK (8.5.3) on Windows platform Server 2008 R2. All servers have recently been migrated from Server 2003 to Server 2008 R2. Of the 3 servers 1 appears to be having a “minor” issue. The problem: everything runs fine but in the Administration Client, the Tab “Server”, subtab “Status” , Server Console will freeze followed by the warning: “Network operation did not complete in a reasonable amount of time. Please retry”. Then, the left pane shows STOP “No access to Console”. If I switch to the other servers it all works fine.

It seems to happen for 1 specific server. If I close the Admin client and reopen, after waiting the network time out and confirming the prompt I gain the ability to make the console connection. The moment I navigate to another tab I get the network time out freeze then prompt.

Does anybody have any ideas?