LibGit2 Clone Fails: "Unable to exchange encryption keys"

[jmulcahy]

Cloning git repos from a private Gitlab instance via Pkg is failing for me on Julia 1.6 and 1.7. The current Julia 1.8 beta works for some reason. Setting JULIA_PKG_USE_CLI_GIT=true with Julia 1.7 also works. I'm using an RSA SSH key.

The error returned is GitError(Code:ERROR, Class:SSH, failed to start SSH session: Unable to exchange encryption keys).

I have no doubt this is due to my peculiar and specific Gitlab set up, but I don't know how to debug this. Any ideas?

[barucden]

#3030 is this related?

[jmulcahy]

I don't think so. It worked on Julia 1.8 on a machine that only had an RSA key, but not 1.6 and 1.7 with that same key. Maybe it works in 1.8 due to some other upgrade that has happened in the SSH stack?

[judober]

I have the same Problem since 1.10. Setting JULIA_PKG_USE_CLI_GIT helped.