Cannot Access Public Folders via ESM

My mail enaabled pubs stopped receiving email a few days ago. Recipients receive an error message that reads:

"The message reached the recipient's e-mail system, but delivery was refused.  Attempt to resend the message.  If it still fails, contact your system administrator." When emailing any mail enabled public folder. The fefault permissons are set to Contributor.

Also, when I tried to access the public fodlers in EXchange System Manager I receive these two errors:

An existing connection was forcibly closed
Facility: Win32
ID no: c0072746
Exchange System Manager


The connection was aborted. Ensure that the settings on your default Web site are correct and refresh the Public Folder tree.
ID no: c103b402
Exchange System Manager

Thank you

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You Cannot Expand Public Folders Through Exchange System Manager

You receive an SSL Certificate error message when you view public folders in Exchange System Manager

Troubleshooting Microsoft Exchange System Manager Public Folder Expansion Problems
cyberleo2000Author Commented:
the HTTP Virtual Server servie was would not start, i failed over the cluster and all is well.
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I have just resolved this error by reinstalling the Windows Service Pack. It appears to have been caused by the following install process:
Install Windows 2003 RTM
Apply Service Pack 1
Install Exchange 2003, it fails because one or more IIS components is missing.
Add Windows components, missing IIS component from RTM CD.
Install Exchange 2003 succeeded.
Install Exchange service packs.

The problem is that after the missing IIS component was installed from RTM CD, the Service Pack was not reapplied. To verify this, check the version of ..\System32\Inetsrv\InetInfo.exe. If it is 6.0.3790.0, this is RTM. You may also find the IIS\Application Pools\DefaultAppPool is also crashing.
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