Event ID - 541

Event Id541
DescriptionIKE security association established. Mode: %1 Peer Identity: %2 Filter: %3 Parameters: %4
Event InformationAccording to Microsoft :
Cause :
If IP Security returns (Mode == Key Exchange (Main mode)), this means that the peer has successfully authenticated, and the Key Exchange security association is established. If the value returned is (Mode == Data Protect (Quick mode)), this means that a Data Protection security association over the given filter has been established.
Resolution :
The main purpose of the success security audits is to track an attacker after the fact.
Reference LinksEvent ID 541 from Source Security

How to Configure IPSec Tunneling in Windows 2000

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