I have installed Openfire 3.4.3 / Spark 2.5.8 and recently test the IM Gateway plug-in to communicate with msn messenger users thru Spark, but when I configure and test the connection, this fails and the msn connection can’t be done. The IM server is setup in my internal network, and I use a firewall to permit access to web and messenger services. I request to my ISP open 1863 port to test the connection with messenger, but, I obtain the same result, the connection test fails. Can someone say me which ports need to be open? or how can I test the 1863 port to know if it is open and is working?