Getting error curl 7 while connecting to APIGEE Edge from Drupal configuaraion

[jyotierudkar]

we have Installed Drupal 9 on one server. And installed Apigee Edge on another server(private cloud).
While making connection :
Configuration -> Apigee Edge -> General
HTTP basic :
while testing the connection encountered below error:
Failed to connect to Apigee Edge : cURL error 7: (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)

[phdhiren]

@jyotierudkar
As per error 7 (CURLE_COULDNT_CONNECT), it seems Drupal is not able to connect to Apigee Edge server.

[jyotierudkar]

What could be the reason ? Are we missing any configuration or something.

What can be done to resolve the connection issue?

[phdhiren]

This could be due to your internal firewall settings, check the connection between both server.

[giteshk]

@jyotierudkar Are you able to run a curl command from the developer portal box to validate there is connectivity between both the servers.

Second problem could be if you are using self signed certs for your management server.

[jyotierudkar]

Yes able to connect from portal box.
Can you explain in brief regarding signed certs