https://www.ejabberd.im/node/6598 en https://www.ejabberd.im/node/6598#comment-59006 <p>Here's a patch for that. I've added it to ejabberd 2.1.x branch:</p> <pre> diff --git a/src/ejabberd_c2s.erl b/src/ejabberd_c2s.erl index 552aa6d..6285688 100644 --- a/src/ejabberd_c2s.erl +++ b/src/ejabberd_c2s.erl @@ -556,10 +556,11 @@ wait_for_auth({xmlstreamelement, El}, StateData) -&gt; fsm_next_state_pack(session_established, NewStateData); _ -&gt; + IP = peerip(StateData#state.sockmod, StateData#state.socket), ?INFO_MSG( - "(~w) Failed legacy authentication for ~s", + "(~w) Failed legacy authentication for ~s from IP ~s (~w)", [StateData#state.socket, - jlib:jid_to_string(JID)]), + jlib:jid_to_string(JID), jlib:ip_to_list(IP), IP]), Err = jlib:make_error_reply( El, ?ERR_NOT_AUTHORIZED), send_element(StateData, Err), @@ -646,10 +647,11 @@ wait_for_feature_request({xmlstreamelement, El}, StateData) -&gt; StateData#state{ sasl_state = NewSASLState}); {error, Error, Username} -&gt; + IP = peerip(StateData#state.sockmod, StateData#state.socket), ?INFO_MSG( - "(~w) Failed authentication for ~s@~s", + "(~w) Failed authentication for ~s@~s from IP ~s (~w)", [StateData#state.socket, - Username, StateData#state.server]), + Username, StateData#state.server, jlib:ip_to_list(IP), IP]), send_element(StateData, {xmlelement, "failure", [{"xmlns", ?NS_SASL}], @@ -799,10 +801,11 @@ wait_for_sasl_response({xmlstreamelement, El}, StateData) -&gt; fsm_next_state(wait_for_sasl_response, StateData#state{sasl_state = NewSASLState}); {error, Error, Username} -&gt; + IP = peerip(StateData#state.sockmod, StateData#state.socket), ?INFO_MSG( - "(~w) Failed authentication for ~s@~s", + "(~w) Failed authentication for ~s@~s from IP ~s (~w)", [StateData#state.socket, - Username, StateData#state.server]), + Username, StateData#state.server, jlib:ip_to_list(IP), IP]), send_element(StateData, {xmlelement, "failure", [{"xmlns", ?NS_SASL}], </pre> Mon, 27 Aug 2012 11:22:00 +0000 mfoss comment 59006 at https://www.ejabberd.im