when trying connect to server from opera, i'm got this server log:
debug - client authorized
info - handshake authorized bIDigTGEsQIc1GBXIjHk
debug - client authorized
info - handshake authorized AtLXuLjQ9XkzgXZrIjHl
debug - client authorized
info - handshake authorized SsW2FTj3khC-1PDXIjHm
All another browser — mozilla, IE, chrome works perfectly.
Version Node.js - v0.11.2-pre, socket.io server - 0.9.14, socket.io client - 0.9.11
Opera version 12.1 supports websockets. Opera 11.0 - 12.0 only supports it partially. Before 11.0 it did not support websockets.
Upgrade your Opera to 12.1 to use websockets.