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Event ID: 5138 Source: Microsoft-Windows-WAS

Level
Description
A worker process '446' serving application pool '1' failed to stop a listener channel for protocol 'http' in the allotted time. The data field contains the error number.
Comments
 
According to T734995, an IIS server responds to requests on a given protocol by using a listener adapter. The protocol-specific listener adapter communicates with the Windows Process Activation Service (WAS) by means of a protocol adapter. If an error occurs when WAS communicates with the listener adapter through the protocol adapter, IIS may be unable to respond to requests on the given protocol.

The suggestion is to stop and restart the IIS application pool. See the article for full details.
From a support forum: "This was actually due to the pool hitting the RAM limit and triggering a recycle."

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