Our Azure Function App fails to connect to Zendesk with the following error:ConnectionResetError(104, 'Connection reset by peer')This happens on every request to our Zendesk subdomain — including a simple unauthenticated GET request:requests.get("https://{subdomain}.zendesk.com/api/v2/tickets.json", timeout=10) The same code with the same credentials works fine locally Our Azure NSG allows all outbound internet traffic No IP Restrictions are configured in Zendesk Admin Center (confirmed by our Zendesk admin) Our Zendesk admin confirmed OAuth is configured correctly and tokens can be generated Other third-party APIs (e.g. ZOHO) work perfectly from the same Azure environment using the same requests library Even a basic unauthenticated GET to Zendesk fails — ruling out any OAuth or credential issueHas anyone experienced this before? Is there a known solution or a way to get Azure datacenter IPs whitelisted on Zendesk's infrastructure level?

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Azure Function App getting ConnectionResetError when connecting to Zendesk API

Our Azure Function App fails to connect to Zendesk with the following error:

ConnectionResetError(104, 'Connection reset by peer')

This happens on every request to our Zendesk subdomain — including a simple unauthenticated GET request:

requests.get("https://{subdomain}.zendesk.com/api/v2/tickets.json", timeout=10)

The same code with the same credentials works fine locally
Our Azure NSG allows all outbound internet traffic
No IP Restrictions are configured in Zendesk Admin Center (confirmed by our Zendesk admin)
Our Zendesk admin confirmed OAuth is configured correctly and tokens can be generated
Other third-party APIs (e.g. ZOHO) work perfectly from the same Azure environment using the same requests library
Even a basic unauthenticated GET to Zendesk fails — ruling out any OAuth or credential issue

Has anyone experienced this before? Is there a known solution or a way to get Azure datacenter IPs whitelisted on Zendesk's infrastructure level?