Abstract: A relay server authentication service for a relay server is described. An apparatus may include a proxy server to receive an authentication request for client authentication information from a first client to traverse a network address translation device. The apparatus may further include a relay server with a relay server authentication service module. The relay server authentication service module may be arranged to receive the authentication request from the proxy server, generate the client authentication information for the first client, and send an authentication response with the client authentication information to the first client through the proxy server. Other embodiments are described and claimed.