Clients sare having trouble connecting to their Exchange 5.5 Service Pack 4
server. It started a week or so ago and after reboot clients can reconnect.
It seems to be getting worse. I didn’t see any exchange errors so I enabled
more logging. Now I am getting event ID 2007 Source MS Exchange IS Private
Category MTA Conections with “ma_open error 0x15.” Some clientswho were
already connected to Exchange were ok but new users getting on got an unable
to open Information Store in Outlook.