"Gateway timeout. Check to make sure the service is running" Error Occurs When Publishing Content With Embedded OAuth Credentials

Issue

When publishing a workbook or data source with embedded OAuth credentials from Tableau Desktop through a forward proxy, the following unexpected error occurs:

Gateway timeout. Check to make sure the service is running
Error Code: C926DA9F

There is no issue if OAuth credentials are not embedded.

Environment

Tableau Server
Tableau Desktop
OAuth Connections
Forward Proxy

Resolution

Configure a forward proxy for OAuth authentication for Tableau Desktop and make sure to pass through the correct forward proxy.

Cause

This unexpected server error occurs when the correct forward proxy is not configured to pass OAuth credentials.

Additional Information

Forward proxy for OAuth authentication
OAuth Connections

The following error can be seen in Tableau Desktop log.txt:

"k":"msg","v":"HTTPRequestor::DoWork::HTTPException 504 <Tableau Server URL>/vizportal/api/clientxml/auth/keychains?language=ja&connection={\"authentication\":\"auth-oauth\",\"class\":\"<database>\",\"oauth-client\":\"server\",\"server\":\"<database URL>\",\"username\":\"<database username>\"
...
"k":"excp","e":{"excp-error-code":"0xC926DA9F","excp-source":"NeedsClassification","excp-status-code":"UNKNOWN"},"v":{"excp-msg":"Gateway timeout. Check to make sure the service is running.\n","excp-type":"HTTPException","msg":"HTTPRequestor: rethrow exception"