Context
I am trying to connect Salesforce with n8n self-hosted (running on GCP) using OAuth2 credentials, but I always get the following error:
error=redirect_uri_mismatch&error_description=redirect_uri%20must%20match%20configuration
Environment
- n8n deployment: Self-hosted on GCP
- Base URL:
https://ai.workflow.xertica.net/
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- Redirect URL automatically generated by n8n:
https://ai.workflow.xertica.net/rest/oauth2-credential/callback
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- Salesforce environment: Production (not sandbox)
- n8n credential config: Environment Type = Production
What has been configured already
- My IT team has added exactly the above Redirect URL in Salesforce → Connected App → OAuth Settings (screenshot attached).
- The following OAuth Scopes are configured:
Full access (full)Perform requests at any time (refresh_token, offline_access)- Consumer Key and Consumer Secret are correctly entered in n8n.
The problem
Despite all of this, the login still fails with the same redirect_uri_mismatch error.
Questions
- Is there any additional configuration required on the Salesforce Connected App, such as disabling these options?
- Require Proof Key for Code Exchange (PKCE)
- Require Secret for Web Server Flow
- Require Secret for Refresh Token Flow
- Is it expected that n8n generates the redirect URL as:
/rest/oauth2-credential/callback
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instead of the /OauthRedirect path I see in some n8n documentation examples?
- Has anyone successfully connected Salesforce OAuth2 with n8n self-hosted on GCP and can confirm the correct Connected App setup?
Next steps
Any guidance on how to resolve this mismatch would be highly appreciated. I am attaching screenshots of the Connected App configuration and the exact error message.
Thanks in advance! 
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