(The error below displays in ESM after about 10 minutes of the hour glass appearing) I have found the MS answer below but am not sure how to check or impliment the fix. Any assistance would be greatly appreciated.
Windows 2000 Server (SP4) Exchange 2000 Server (SP3+rollup package)
ISA on Separate server than Exchange
Error ID number: c007274c
A connection attempt failed because the connected party did not respond after a period of time, or established connection failed because connected host has failed to respond.
• Incorrect host headers defined on clustered virtual server.
• Add or remove the correct host headers to Exchange virtual server in Internet Information Services (IIS) Manager