Using chrome://net-export/ to troubleshoot ARERR 9350/9351 or http 0 errors - Remedy AR System Mid Tier

Knowledge Article

Using chrome://net-export/ to troubleshoot ARERR 9350/9351 or http 0 errors - Remedy AR System Mid Tier
From time to time. Fiddler capture does not see some requests issued by Chrome because they were cancelled. Chrome net export internals can be used instead
Remedy AR System Server
AR System Mid Tier
Any web application browsed using chrome
Remedy AR System Server
AR System Mid Tier
Any web application browsed using chrome
Using the Chrome F12 network capture, some cancelled requests are seen but they are not capture with the Fiddler utility.   Other symptoms are that the users may see ARERR 9350/9351 errors with http status 0.
How can I understand the reason behind that?
 
This knowledge article may contain information that does not apply to version 21.05 or later which runs in a container environment. Please refer to Article Number 000385088 for more information about troubleshooting BMC products in containers.

 To use chrome://net-export/
  • Open the Chrome browser 
  • Open this URL "chrome://net-export/ ".  Select "include raw bytes"  and click "Start Logging to disk" (Chrome will ask you for the location of the file where log will be saved) 
  • Make sure the tab where net-export is open stays open, closing it will stop the logs too.
  • Navigate the application causing the problem
  • Once the problem replicates, go back to "chrome://net-export/" tab and click "Stop Logging"
User-added image

This log can then be loaded by Chrome.
Some situations that have been found with this log
  • Network cache (causing redirection from HTTP to HTTPS)
  • DNS issues as OS DNS entries expire too fast (every few seconds)
  • Network problem OS 10054 error
  • Connection aborted OS error 10053 
  • Traffic shaper on the ISP providing Server connectivity to Mid-tier server capping bandwidth 
  • Firewall blocking transactions or packets
  • Some chrome extensions like https://digitalguardian.com/ found to redirect from POST backchannel request to GET, but without the POST payload, therefore the request is invalid for Mid-tier purposes
  • Proxy can avoid some files from being downloaded: net_error = -355 (ERR_INCOMPLETE_CHUNKED_ENCODING). In this case Excel password / encrypted protected files

Reference article:  How to read Chrome Internals logs
Remedy AR System Server
AR System Mid Tier
Any web application browsed using chrome
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