Event ID - 156

Event Id156
SourcePolicyAgent
DescriptionMatching filter exists in filter list.
Event InformationCause:

This issue will occur if you change a security rules action and you update the rules IP filter list at the same time.

Resolution:

To workaround this behavior, change the rules filter action and wait until the client computer updates the IPsec policy, before you update the rules IP filter list.

NOTE: An example of changing a rules filter action is changing from Request Security to Require Security.
Reference LinksEvent ID 156 of Source PolicyAgent

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