Unable to clone GitHub repos in GitLab

I’ve installed GitLab via One-Click install on a droplet. It’s working fine for repos I’ve created within GitLab, but I can’t seem to clone repos from GitHub.

Here’s the general architecture:

• GitLab 7 installed on its own droplet using One-Click install
• URI of the server is gitlab.mydomain.com
• mydomain.com is on a separate droplet

Here’s the background of the issue:

• Attempted to clone public repo with https clone uri; no dice
• Attempted to clone public repo with https fork uri (clone_uri/fork); no dice
• Forked public repo into my personal GitHub account and attempted authenticated clone in GitLab with the https clone uri; no dice
• In case you’re curious, the public repo is https://github.com/PHPMailer/PHPMailer

When trying to clone my GitHub fork, I used the URI syntax of https://username:password@github.com/path/to/repo, and for all other attempts I used the standard clone URI. In all instances GitLab generated the error “Import failed. Retry?”

Prior to using this One-Click installed GitLab droplet I had an old test droplet I set up myself with Ubuntu 14.04 and GitLab 7, and, IIRC, I was able to clone projects from GitHub with no issue.

I’m not familiar with how the One-Click install config’d everything. Any ideas of error logs I can look at?

Based on Googling I think it could either be

1. nginx config issue
2. SSH key issue with GitHub
3. A physical limitation of my brain

Thanks in advance!

-Tim