Apple - Git hangs with a ssh remote URI after 10.15.4 update
Debugging steps:
- Attempted to connect with netcat:
$ nc -v gitlab.example.com 30814
Connection to gitlab.example.com port 30814 [tcp/*] succeeded!
SSH-2.0-OpenSSH_7.2
^C
- Suspecting a broken ssh client, I installed openssh using brew:
$ brew install openssh
...
$ /usr/local/bin/ssh -V
OpenSSH_8.2p1, OpenSSL 1.1.1d 10 Sep 2019
$ /usr/local/bin/ssh -p 30814 [email protected]
Welcome to GitLab, @username!
Connection to gitlab.example.com closed.
After refreshing my shell environment to ensure that the new ssh is found in my $PATH, git operations began functioning as expected with ssh:// URIs.
Searching turned up this user submitted bug: ssh fails when using -p flag
The workaround detailed in the bug is to use the remote host's IP address instead of the DNS name. I can confirm that this worked for me:
$ /usr/bin/ssh -V
OpenSSH_8.1p1, LibreSSL 2.7.3
$ /usr/bin/ssh -p 30814 [email protected]
Welcome to GitLab, @username!
Connection to gitlab.example.com closed.
The apparent trigger for this bug is using ports greater than 8192 in conjunction with a host's DNS name.