I have got an Azure Function APP with HTTP trigger calling a webservice and passing on Soap message containing XML. (hosted via APP service plan) . Locally, using VS2019 the function app successfully reaches the web service and receives response within 25 seconds or less. When published to Azure, the function times out after < 23 Seconds.
I get a HTTP server 500 error back:
2021-10-20T09:54:46.263 [Error] Executed 'XXXX' (Failed, Id=0cc4db22-f9ba-4c5d-9f6e-ecd1da394333, Duration=22131ms)A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
We have whitelisted the outbound ip addresses of the function app, but the service's firewall is not receiving the request at all. Can a function app NOT call a https url when triggered?