ISA Server cannot connect to %1 proxy server, because the server requires authentication, either when chaining or for intra-array communication. However authentication failed because the specified credentials were incorrect. Check authentication credentials and try again.

Details
Product:	Internet Security and Acceleration Server
Event ID:	14000
Source:	ISA Server RPC Filter
Version:	4.0.3443.594
Component:	ISA Server Services
Message:	ISA Server cannot connect to %1 proxy server, because the server requires authentication, either when chaining or for intra-array communication. However authentication failed because the specified credentials were incorrect. Check authentication credentials and try again.

Explanation
Authentication failed because the specified credentials were incorrect.

User Action
Verify that the specified credentials are the credentials required for authentication, and then try again.