I don't know what the problem is, but I can confirm it is not your client. I logged in fine to your server using Titanium, but with SoD (Dec 19 2008 build), a trace shows the client sending OP_AckPacket and OP_ZoneEntry, but the server (zone) never responds (it should respond with OP_PlayerProfile).
I don't know if it is your -march setting bugging it, my Linux server (Gentoo, 32bit) is built with the default -march=i686
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