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15. New STUN Error Response Codes

This document defines the following new error response codes:

  • 403 (Forbidden): The request was valid but cannot be performed due to administrative or similar restrictions.

  • 437 (Allocation Mismatch): A request was received by the server that requires an allocation to exist, and no allocation exists, or a request was received that requires no allocation to exist, and an allocation exists.

  • 441 (Wrong Credentials): The credentials in a (non-Allocate) request do not match those used to create the allocation.

  • 442 (Unsupported Transport Protocol): The Allocate request asked the server to use a transport protocol between the server and the peer that the server does not support. NOTE: This does NOT refer to the transport protocol used in the 5-tuple.

  • 486 (Allocation Quota Reached): No more allocations using this username can be created at the present time.

  • 508 (Insufficient Capacity): The server is unable to carry out the request due to some capacity limit being reached. In an Allocate response, this could be due to the server having no more relayed transport addresses available at that time, having none with the requested properties, or the one that corresponds to the specified reservation token is not available.

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