masaori335 opened a new pull request, #13811:
URL: https://github.com/apache/trafficserver/pull/13811

   We faced connect attempt errors like below with 10.2.x, but this doesn't say 
why it's failed much.
   ```
   CONNECT: attempt fail [CONNECTION_ERROR] to X for host='Y' sm_id=Z 
connection_result=EIO [5] error=SUCCESS [0] retry_attempts=0
   ```
   
   I found a regression. Since a114d59 
(https://github.com/apache/trafficserver/pull/7580) the errno carried by 
NET_EVENT_OPEN_FAILED was dropped, so every immediate connect failure was 
logged as `connection_result=EIO error=SUCCESS` and the cause could not be 
diagnosed. This also left the ENET_THROTTLING and TS-1424 EADDRNOTAVAIL 
branches unreachable.


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