3133984 - Error: Proxy Timeout and Failed Requests with 502 Response Code

Symptom

While executing an ImpEx in HAC, accessing an Website/Storefront or Backoffice an error screen with below message appears:

Proxy Error
The proxy server received an invalid response from an upstream server
The proxy server could not handle the request
Reason: Error reading from remote server

In other scenarios, in Dynatrace you can see requests with response code 502 traces failing around a specific time (e.g.: 1 minute, 10 minutes) and when checking the logs at the same timeframe, the following can be found:

[proxy_http:error] [pid 144717:tid 139768065645368] (70007)The timeout specified has expired: [client 44.201.212.46:52692] AH01102: error reading status line from remote server xx.xx.xx.xx:8081
[proxy:error] [pid 144717:tid 139768065645368] [client 44.201.212.46:52692] AH00898: Error reading from remote server returned by /rest/v2/xxx/xxx

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

Environment

SAP Commerce
SAP Commerce Cloud

Product

SAP Commerce Cloud all versions ; SAP Commerce all versions

Keywords

Proxy Timeout, Error reading from remote server, proxy server, hybris, ccv2, response, request, 502, timing out , KBA , CEC-SCC-PLA-PL , Platform , CEC-SCC-CLA-ENV-EMG , Environment Management , Problem

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