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nessus causing domain Controller issues

Subject: nessus causing domain Controller issues
Date: Mon, 28 Jan 2008 11:51:32 +1300
Hi there

We run daily 'lite' scans against our LANs, and it appears some of the 
Nessus tests are triggering a fault on the DCs (since Nov) - causing 
them to reject basically all AD requests for a few minutes while they 
recover.

The DCs report:

RPC server is too busy to complete this operation

The 'lite' scan we run is primarily looking for missing MS patches, but 
definitely has "disable dangerous rules" enabled - and yet appears to be 
causing this. (i.e. we run it at 2pm local time and between 2-3pm is 
when the problem occurs, and when we turn the scanner off for a few days 
the problem goes away)

These DCs are Win2K3-SP1 (not SP2) and are patched up to Oct 2007. Could 
it be some rule changes since then in Nessus are causing a fault, and if 
so, should they be flagged "dangerous" so that they are disabled?

This is with nessus-3.0.6 under RHE4

-- 
Cheers

Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1

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