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A listener channel for protocol 'http' in worker process '####' serving application pool '...' reported a listener channel failure.  The data field contains the error number - APP POOL CRASHING!

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Last Modified: 2018-09-28
I am running a .NET 2.0, 32-bit application in IIS.  Recently the app pool keeps crashing as soon as I start it.  It was fine for over a year.  I keep getting a series of listener channel errors:

A listener channel for protocol 'http' in worker process '4732' serving application pool ... reported a listener channel failure.  The data field contains the error number.
I get this error 5 times then the APP Pool crashes with a browser 503 error.  Worker process numbers are always the same 5.  

Worker process '1084', then '4732', '5644', '6064' and '3724' -- all listener channel errors and application pool crashing.  I don't understand what changed.  There were some updates on the server 2 weeks ago, but nothing else was modified.  Can someone shed some light on this issue for me?
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