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  • Thx for the input. It does appear to be an old key (running the code returned Protocol major versions differ: 1 vs. 2), however one of my colleagues, also running OS X (10.10 in his case vs. 10.10.5 in my case) can successfully log in with ssh-agent and the exact same key. Commented Aug 19, 2015 at 19:38
  • Probably your colleague is defaulting to ssh version 1. This isn't necessarily advisable, but you can put Protocol 1,2 in the appropriate stanza of your ~/.ssh/config file (Below a line for Host 12.34.56.78.) Better would be to insert a version 2 key in the authorized_keys file on the server machine. Commented Aug 20, 2015 at 10:43