Hello, after a change of IP, our OTRS installation is not able to send notifications anymore. At error_log we see: [Thu Oct 11 09:06:02 2012] [error] [client 194.79.86.4] Invalid method in request \x03 [Thu Oct 11 09:06:06 2012] [error] [client 194.79.86.4] Invalid method in request \x03 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] ERROR: OTRS-CGI-10 Perl: 5.8.8 OS: linux Time: Thu Oct 11 10:58:33 2012, referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] , referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] Message: Can't connect to LXWMTS02: Invalid argument!, referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] , referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] Traceback (11551): , referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] Module: Kernel::System::Email::SMTP::Send (v1.21.2.2) Line: 91, referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] Module: Kernel::System::Email::Send (v1.45) Line: 553, referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] Module: Kernel::System::Ticket::Article::SendAgentNotification (v1.185.2.2) Line: 2073, referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] Module: Kernel::System::Ticket::Article::ArticleCreate (v1.185.2.2) Line: 370, referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] Module: Kernel::Modules::AgentTicketClose::Run (v1.46) Line: 494, referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] Module: Kernel::System::Web::InterfaceAgent::Run (v1.35) Line: 824, referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] Module: /opt/otrs/bin/cgi-bin/index.pl (v1.87) Line: 47, referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 10:58:33 2012] [error] [client 172.26.129.198] , referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 [Thu Oct 11 11:00:07 2012] [error] [client 172.26.129.198] ERROR: OTRS-CGI-10 Perl: 5.8.8 OS: linux Time: Thu Oct 11 11:00:07 2012, referer: http://172.26.130.5/otrs/index.pl?Action=AgentTicketClose&TicketID=489 The old IP used to be 172.26129.21 and now is 172.26.130.5. Since the SMTP server LXWMTS02 is reachable and the login/password used for authentication did not change, I don´t know what could be happening? Some info stored in database or any config file maybe? Does anyone have some idea? Thanks for any input and feedback you can provide.