It's a patch for the bug that asks you to re-enter the password of an account when you change any of the permissions through enterprise manager.

http://support.microsoft.com/default.aspx?kbid=826161

The error you are getting is due to a network error connecting to the exchange server. This could be because mail was stopped and the period for mail to start...

When's it due out? (been too busy with my head stuck in the sand trying to figure out my 2k problems to look at 2k5)

A quick search suggests a couple of Q articles that may be worth looking at regarding this issue:

http://support.microsoft.com/default.aspx?scid=kb;en-us;827178

http://support.microsoft.com/default.aspx?scid=%2Fservicedesks%2Fbin%2Fkbsearch.asp%3FArticle%3D328736

Check you nois.eng file and see if the hyphen is in there, that could skew everything.

There might be some issues due to the XP firewall installed as a part of SP2, check out the following Q Articles...

http://support.microsoft.com/default.aspx?scid=kb;en-us;841251

http://support.microsoft.com/default.aspx?scid=kb;en-us;841252

Are you able to use the maintenance plan to backup that database to a different drive on the same server?

Rather than restarting you would be better served by setting the database into single user mode before attempting the restore and then resetting it back to multi user mode afterwards...

--Before...

The databases that back up correctly using the maintenance plan, are they backed upt to the same location? Have you checked and confirmed that that directory structure exists?

No errors reported?

Check out http://www.4guysfromrolla.com/webtech/041800-1.shtml for some starter ideas.

The reason that you are getting the problem is not so much that the log is full, more likely you are running some query that is growing tempdb until the...

I would add the DTS to a job and run sp_start_job (you could also use xp_cmdshell to execute a dtsrun command but not recommended)

What exactly do you mean by restart a database? Do you mean to kill all current connections to leave it "clean"? Detach a database and reattach it? Set the database...

Try adding select permissions for those users to the msdb..sysjobschedules table.