Error changing SMTP settings in IIS Manager after configuring incoming email in the farm

Came across one of those bizarre scenarios where you apply a hotfix to resolve an issue and it causes a separate issue.



After configuring incoming mail settings on a MOSS farm I started to get an unspecified SMTP error when I tried changing SMTP settings from within IIS Manager. Further investigation revealed that the issue was caused by my applying the hotfix (KB946517) to resolve Event ID 6398, 7076 and 6432 errors.

The problem is described in detail here on the MSDN blog http://blogs.msdn.com/vijaysk/archive/2008/04/14/issue-smtp-configuration-unspecified-error.aspx



and the subsequent Microsoft Knowledgebase article is here http://support.microsoft.com/default.aspx/KB/950426



A hotfix is now available from Microsoft which resolves this issue.