So it's been a while since we posted, and generally that's because DPM is a godsend. It almost works without attention, and apart from a few quirks we've discovered, and the odd thing that happens but isn't ACTUALLY documented anywhere sane, things are good.
Compared to Backup Exec (we stopped using it on BEWS 10d), DPM 2010 seems to "just get it" when it comes to backups. Once a backup is setup, it knows how to backup, it knows when to backup and it actually backs up.
If there's an issue it attempts to fix minor issues via consistency checks etc, and if there's really an issue, it is glaringly obvious for you to fix it. That's pretty good news when you're used to Backup Exec being hell on earth, randomly dropping jobs to "hold" status because of an issue and so on.
However yesterday a random issue cropped up which I hadn't seen before.
One of our Protected Servers Agent Status in the DPM console was "unavailable" - and the error logged was "10048 0x02740". The protected server in question is running Exchange Server 2007.
This appears to have happened because the IIS process on the protected server was suddenly using TCP Ports 5718 and 5719. This prevents the DPM Remote Agent from starting.
To fix this, you can simply:
(a) Stop IIS (iisreset /stop)
(b) Run the DPM Agent
(c) Start IIS (iisreset /start)
...or in our case, do nothing - by this morning it had cleared itself (we hadn't restarted IIS as we didn't want to drop the live users connected via OWA and OutlookAnywhere on this box).
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