XEP-Remarks/XEP-0260: Jingle SOCKS5 Bytestreams Transport Method
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If the nominated candidate is of the proxy type and either party cannot connect to the proxy (for example because of a restrictive firewall), the failing party shall send a transport-info message containing an <proxy-error/> element. The parties shall then consider the bytestream unsuccessful and SHOULD attempt to fall back to another transport as described in Fallback Methods.
This is a little bit weird. If remote send me proxy candidate and I can't connect to any remote candidate including this proxy, I would rather send <candidate-error>.