Hello Nintex Community,

I’m configuring a Salesforce integration in our K2 environment and running into three main issues:

• “URL No Longer Exists” when hitting the OAuth callback endpoint OR 

  error=redirect_uri_mismatch&error_description=redirect_uri%20must%20match%20configuration

• Authentication timeout during the OAuth handshake

• Invalid endpoint errors on REST operations in my workflows

So far I’ve:

1. Matched the callback URL exactly in both Salesforce and K2

2. Enabled TLS 1.2 on the K2 server

3. Confirmed outbound internet access and correct Consumer Key/Secret

What additional K2 settings (e.g. web.config, firewall rules) or troubleshooting steps should I try to resolve these errors? Any best practices for validating the callback and REST endpoints would be greatly appreciated.

Thank you!