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Event ID: 139 Source: WebProxyServer

Proxy server Server1 requires proxy to proxy authentication. Proxy server Server2 is not configured to do so.
This problem can be caused by a regression in one of the security hotfixes in IIS. See ME309562 for details on this situation.
If there is an array of Proxy Server computers, or if they are chained, they must authenticate communication between servers. Configure the identified Proxy Server computer for authentication.

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