I have an SBS 2003 server on a small network. I use the standard SBS Backup and frequently go into Server Management Home Page, click Backup and I can see the status of the daily backups with hyperlinks to details. A few weeks ago the page began returning an HTTP 400 page not found. I do not appear to have any other problems with IIS, other pages in Server Management or the Backups themselves. I have reconfigured the backup a couple times making innocuos changes to see if it would restore the page. I can see the changes are happening and the backups are being made with no Backup errors in the logs. While using the wizard to reconfigure the backup works fine, it does not restore the log/report page. Not seeing anything unusual in the Event logs. To my knowledge I have loaded nothing recently that would account for this. I do routinely load the MS recommended security patches, but I cannot say yes or no whether the load of one of those coorelates to the loss of the page.
(I am on SBS 2003 R2, Service Pack 2)