Server Hangs - Error probing cluster 81:9D

Just a quick note in case anyone else has seen this error! We’ve had a few crashes in the last few days whereby the console responds fine but the server doesnt accept any client connections… when we issue a quit to restart it hangs with the error:

Error probing cluster… 81:9D

Any pointers greatly appreciated!

Subject: Server Hangs - Error probing cluster 81:9D

For reference in case anyone else gets this our diagnosis lead us to McAffee/GroupShield which was hanging and causing Notes to hang in turn…