I have a MOSS 2007 with a large content DB, around 96GB. Single WFE (win2k3R2) and single banckend SQL 2005 (win2k3R2). Both are x86 server with 4GB RAM. MOSS has SP1 installed and runs Forefront for SharePoint with SP1.
Recently we started receiving messages that users were unable to upload files or save any files opened from MOSS back on to the doc libraries. I suspected this to be something to do with Forefront as it had done so in the past. The AV settings were to scan the file when uploaded or downloaded. I removed scan from downloading files but no avail.
I tried various other things such as reset iis, and reset search index as event log was full of error message 4127. Eventually resetting w3wp seemed to do the trick and system was able to upload and save docs.
But then it broke again and no amount of tricks seem to get it back to normal. The error message is "The URL ' IT Documentation/IT Reports/ ITC Reports/ Weekly Report.docx' is invalid. It may refer to a nonexistent file or folder, or refer to a valid file or folder that is not in the current Web."
In the SharePoint log I also get the following mesasage" w3wp.exe (0x79D4) 0x3980 Windows SharePoint Services General 8kh7 High The URL ' IT Documentation/SharePoint action plan.doc' is invalid. It may refer to a nonexistent file or folder, or refer to a valid file or folder that is not in the current Web."
MOSS 2007 has not been updated to SP2 but has had some updates such as .NET 3.5 installed.