As part of our service we offer a SOCKS5 proxy which is accessible on your assigned QuotaGuard server on port 1080. SOCKS5 provides TCP level proxying so can handle all sorts of traffic including LDAP.
Ruby has a great LDAP library which can handle the bulk of the work but at the moment it doesn't support sending traffic via a proxy. To get around this we have produced a patched version of net-ldap which routes all LDAP traffic through our SOCKS proxy. This requires a patched version of socksify-ruby so you just need to install these two gems from our Github repository.
#Gemfile gem 'socksify', github: "quotaguard/socksify-ruby", branch: "master" gem 'net-ldap', github: "quotaguard/ruby-net-ldap", branch: "master"
We have examples for other common libraries as well, but if you can't find what you are looking for just send us a support ticket and we'll get one sent to you.