I'm currently running GW 8.0.2 HP1 on my NW 6.5 SP8 server, and ever since upgrading to GW8 earlier in the year, I get a number of calls from users saying that they get a popup saying that the Server or Post Office Agent is Unavailable with an OK/Cancel button. When I check on the POA it is up and running. The users usually just click Ok, which closes GroupWise and they end up reopening it. It seems like certain systems will get this error for a few days then it will move on to a different group of systems after a few days. What could be causing this?