Cannot push to the destination repository

This is the most common problem. Carefully read the logs on the GitHub Action pages of the source repositories. The Action tries to write the errors and gives possible solutions / hints. To solve this problem, the first suggestion is to redo the setup steps. If this still does not work, the following problems have occurred in the past, so they may be useful places to start to fix the problem:

  1. User was logged in to GitHub with an account that did not have permission to push into the destination repository. The Action could not push (permission denied).

  2. Expired token.

  3. SSH-generated key pair (public/private) was set in the wrong way.

  4. Wrong copy-paste including spaces or other characters that did not belong to the key / token.

Use the following tests to ensure the setup is correct.

Test connection to GitHub using the key pair

The public key should have been added into the repository as an SSH deploy key.

Then, do:

$ ssh -o IdentitiesOnly=yes -i .ssh/id_push-to-another-repository-output_ed25519

Instead of .ssh/id_push-to-another-repository-output_ed25519, use the file as you created it. This is the private key (it does not end with .pub). If you used the correct private key for the correctly-uploaded public key, it will print something along the lines of:

If you see: .. code-block: Permission denied (publickey).

the public key for this private key is not available on GitHub.

Verify that the key is in the correct repository

$ ssh-keygen -lf .ssh/id_push-to-another-repository-output_ed25519

The output will be something like:


This should match what you see in the deploy key of the destination repository. If it does not match, the deploy key is not properly set (perhaps different public/private keys were used, for example).

Verify the Permission of the key

Visualise the key in the destination repository, and it should say:


Test the Personal Access Token

If the Personal Access Token method was used for the setup, check it has the correct permissions to push to the destination repository and that it has not expired.

In your terminal do:

$ git clone
# YOUR_ACCESS_TOKEN probably starts with ghp_
$ cd REPO
$ git checkout -b test
$ git push origin test

For example, if the token did not have permission to write (because repo was not enabled for this token), you might see the following:

Error: URL using bad/illegal format or missing URL

It seems that GitHub created a Personal Access Token with a space character. This would happen if the Personal Token had a # or some other characters.

Firstly, check that no space was copied by mistake to the API_TOKEN_GITHUB. If this was the case, do the correct the copy.

Secondly, if GitHub created a token with # or a space inside, I suggest creating a new one.

The problem, for those that are curious, is that the Personal Access Token is used in the git URLs and the URLs don’t support #. The error URL using bad/illegal format comes from the curl library used by git.

More information:

Error: RPC failed; curl 92 HTTP/2 stream 0 was not closed cleanly: CANCEL (err 8)

Full error as seen in the output of the action:

[+] Pushing git commit
    error: RPC failed; curl 92 HTTP/2 stream 0 was not closed cleanly: CANCEL (err 8)
    send-pack: unexpected disconnect while reading sideband packet
    fatal: the remote end hung up unexpectedly
    Everything up-to-date

This happens if the Personal Access Token authentication is being used (when PAT is used git uses https protocol using curl as a library).

First suggestion: use SSH deploy keys. The reason is that when using ssh the error messages might give better information.

Two possible causes of the problem:

  • there are big files (bigger than 100 MB?) and git-lfs is not in use. Use the action version 1.6.0 or newer to have git-lfs support and make sure that these files are stored in git-lfs. This is a limitation on GitHub.

  • if the action is executed on a GitHub workflow on premises: make sure that can connect to or the github-server specified in your options.

Thanks Travis for submitting this error and following the debugging steps.

Error: remote: Repository not found

Bug report where the GitHub Action ended with:

remote: Repository not found.
fatal: repository '' not found

See the possible solution in the comments of