Installing julia v1.6.2 behind proxy

[johnh]

Have you tried Julia 1.7 ? Does command line git work for you on external repos?
Please have look at this thread

Julia repl is ignoring my ssh config file

I believe by default Julia will still use its own libgit2, but in 1.7 you can set the environment variable JULIA_PKG_USE_CLI_GIT=true to force it to use your system git instead.