It does indeed sound strange. I haven't heard of such a problem before, so I don't have any recommendations how to fix it. I would recommend that you add a connectivity verifier, if possible, to the server. You can see if when you get the RPC alert you also get a connectivity alert. It may provide some hints. I would also suggest contacting PSS to get someone from Microsoft investigate it. HTH, Ori. ________________________________ From: isapros-bounce@xxxxxxxxxxxxx [mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Jason Jones Sent: Wednesday, August 09, 2006 1:26 AM To: isapros@xxxxxxxxxxxxx Subject: [isapros] Re: RPC filter - connectivity changed Thanks Ori - kinda how I expected the alert to be. I get the ISA alerts 2/3 times every couple of weeks and lots of event log errors, saying "RPC server available", then "RPC server unavailable" in a complete loop. The only way to solve the issue is to reboot all array members - ouch! Whilst ISA is in this state all existing MAPI clients remain working, but all new sessions fail. However, I can see no reason why the Exchange server (the RPC published server) should suddenly appear unavailable - I also cannot see why the destination server is at fault if a reboot of ISA fixes the problem. Kinda feels like ISA is getting confused to me :-\ JJ ________________________________ From: isapros-bounce@xxxxxxxxxxxxx [mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Ori Yosefi Sent: 08 August 2006 18:23 To: isapros@xxxxxxxxxxxxx Subject: [isapros] Re: RPC filter - connectivity changed This alert is issued when a published RPC server has gone offline / came back online. When attempting to establish a connection with the RPC server, if the connection attempt fails (for the first time) then this alert is issued. Later on, when a connection attempt is successful (for the first time) then this alert is issued again. HTH, Ori. ________________________________ From: isapros-bounce@xxxxxxxxxxxxx [mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Jason Jones Sent: Tuesday, August 08, 2006 8:10 PM To: isapros@xxxxxxxxxxxxx Subject: [isapros] RPC filter - connectivity changed Hi, Anyone seen the "RPC filter - connectivity changed" ISA alert? Under what scenario does this get trigged? Is this an ISA problem or an indication that the published RPC server is at fault? Cheers JJ <<rpc filter.JPG>>