I've just installed Centos 4 on an Acer G310 server - everything's gone well except I'm not able to SMTP connect to my upstream mail server (I've installed postfix + MailScanner) - I managed to find sort out the dovecot side of things but SMTP remains quite silent - the maillog shows an attempted connect but then a timeout: May 9 13:08:45 woking postfix/smtp[7895]: deliver_request_final: send: "connect to mailhost.zen.co.uk[212.23.3.98]: Connection timed out" -1 If I connect manually (telnet mailhost.zen.co.uk 25) nothing happens - no response is shown and I presume if I left things for long enough I'd see a timeout message? Here's the output from netstat -pant: Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:32769 0.0.0.0:* LISTEN 2048/rpc.statd tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 2028/portmap tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 2242/vsftpd tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 2181/cupsd tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 5201/master tcp 0 1 192.168.101.11:32847 212.23.3.98:25 SYN_SENT 7930/telnet tcp 0 0 :::993 :::* LISTEN 3416/dovecot tcp 0 0 :::995 :::* LISTEN 3416/dovecot tcp 0 0 :::110 :::* LISTEN 3416/dovecot tcp 0 0 :::143 :::* LISTEN 3416/dovecot tcp 0 0 :::80 :::* LISTEN 2345/httpd tcp 0 0 :::22 :::* LISTEN 2217/sshd tcp 0 0 :::25 :::* LISTEN 5201/master tcp 0 0 :::443 :::* LISTEN 2345/httpd tcp 0 0 ::ffff:192.168.101.11:22 ::ffff:192.168.101.20:4450 ESTABLISHED 3319/0 tcp 0 192 ::ffff:192.168.101.11:22 ::ffff:192.168.101.20:4758 ESTABLISHED 5724/1 I notice that there's an attempt to make a connection but that's it - any ideas what might be causing this - I'm not running a server-based firewall. Over to you with thanks. Nigel