From the error code (HTTP 504) it looks like the Stash server is temporarily overloaded - the request times out. Atlassian support is working on the issue and is trying to get to the bottom of the problem. For now, can you try switching to SSH and push?
First, you need to upload your SSH public key to Stash. In the Stash web UI, click your user icon in the top right corner, then Manage Account. Choose SSH keys and upload your public key. Now go to your repository in Stash and copy the SSH clone URL (click Clone from the menu on the left) Finally, on the command line do the following: git remote add origin-ssh <the-ssh-clone-url> then push by doing git push origin-ssh <the-branch-you-want-to-push>
Based on 504 error code, I think there is connectivity issue. Server is down.
Please refer to below link for error detail.
Please check with your stash administrator, if there are able to connect to the server.
For SSH, you can select SSH url if it is enabled for Stash Instance.
Please note: SSH will work only if there is connectivity between you machine and stash server
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