OWA -HTTP 440 Timeout

[MalcolmS]

I am running Exchg 2003 SP1, on Server 2003 in 2000 AD Domain. Single exchg
svr, no front-end.

Recently reinstall IIS to resolve an issue with 3rd party SPAM Filter
Software. After removing the 3rd party app, removing IIS and then
reinstalling IIS, reinstalling Exchg, reapplying Exch SP1 and hotfixes and
finally the 3rd Party app, my users are encountering Timeout error when
accessing OWA (SSL configured). This occurs once daily. OWA access is
restored by issuing iisreset command.

The process of removing and re-installing IIS was recommended by MS Support.
When I advised the MS Support Tech of result of IIS re-build I was told I
would have to open a separate case to resolve this problem.

I have verified permissions and re-sync'd the IUSR passwords and disabled
and re-enabled FBA with no effect on this issue. The articles and blogs I've
found on the net all reference solid 440 timeout failures. In this scenario,
OWA works perfectly for 16 to 20 hrs and then fails to establish new
connections.

I would greatly appreciate suggestions on possible resolution steps.

Thanks,
M~