Both PCs running with XP Service Pack 3. Yes, when I run netstat on my PC with 4.2.3 twice I got different outputs. The ports 1098, 1099, 3873, 4444, 4445, 4446, 8009, 8080, 8083 and 8093 are always the same, but three ports change: 1153, 1154, 1157 at the first call 1158, 1159, 1162 at the second call 1167, 1168, 1170 at the third call "telnet [user-name] 1099" does not work on both PCs. It's always the same error: Connecting to [user-name]...Could not open connection to the host on port 1099: Connection failed I have started JBoss on both PCs within Eclipse and on the command-line. The output is the same: JBoss started within Eclipse (host-name in the Overview is localhost): INFO [Http11Protocol] Starting Coyote HTTP/1.1 on http-localhost%2F127.0.0.1-8080 JBoss started within Eclipse (host-name in the Overview is 127.0.0.1): INFO [Http11Protocol] Starting Coyote HTTP/1.1 on http-127.0.0.1-8080 JBoss started on command line: INFO [Http11Protocol] Starting Coyote HTTP/1.1 on http-127.0.0.1-8080 View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4252991#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...