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The 504 status is most likely because you're trying to access an internal server through the proxy
could you please try to run the below command on your studio machine to see if it work?
git config --global --unset http.proxy
OR
git config --global http.proxy ''
please refer to the article https://stackoverflow.com/questions/21085607/git-error-the-requested-url-returned-error-504-gateway-timeout-while-accessing
In the Talend Studio login window, click the Manage Connections button. The connection setup wizard opens. Click the [+] button under the Connections area to create a new connection, select Remote TAC from the Repository drop-down list, and enter a name for the connection in the Name field. official website