I have an Ubuntu 12.04 server setup with Virtualmin/Webmin latest version using a self-signed certificate generated during installation working fine for more than a year without any problem. This week I installed a GoDaddy certificate (Not wildcard) in one of my 7 domains that is not the default domain. Following the Virtualmin documentation everything was done well and the https site is ok but some problems started to happen with Postfix Mail Server. It complete stopped and could not be started again. After try to restart the server and postfix checking mail.log for errors found:
Jul 7 18:04:01 server1 postfix/master[12140]: fatal: bind xxx.xxx.xxx.xx port 587: Address already in use
Jul 7 18:31:36 server1 postfix/postfix-script[13766]: fatal: the Postfix mail system is not running
Jul 7 18:31:37 server1 postfix/postfix-script[13865]: starting the Postfix mail system
Jul 7 18:31:37 server1 postfix/master[13866]: fatal: bind xxx.xxx.xxx.xx port 587: Address already in use
Jul 7 18:37:07 server1 postfix/postfix-script[14208]: starting the Postfix mail system
Jul 7 18:37:07 server1 postfix/master[14209]: fatal: bind xxx.xxx.xxx.xx port 587: Address already in use
I am using external DNS from GoDaddy instead of Virtualmin BIND. Checked for incorrect configurations and found nothing. Made a complete verification in the server terminal with nmap, netstat, iptables and found nothing wrong. All necessary ports are open including port 587.
The server IP is XXX.XXX.XXX.XX that is shared with 6 virtual servers including the server host "server1.myhost.com" in eth0:0 and the certificate is installed in IP YYY.YY.YYY.YYY (Private IP) running in eth0:1 just for the domain mycustomerdomain.com.
If SSL for mycustomerdomain.com is disabled in Virtualmin panel, postfix start again normally. As soon as SSL is enabled SSL postfix stops with the same log entry. I am sure that the certificate is OK. I think that it is a bug in Virtualmin because although this installation is more than year old it was made from a fresh Ubuntu 12.04 LAMP install and has been updated every week ever since.
This is the result of netstat -tlnp | grep 587 after disable SSL and start Postfix:
root@server1:~# netstat -tlnp | grep 587
tcp 0 0 0.0.0.0:587 0.0.0.0:* LISTEN 24934/master
tcp6 0 0 :::587 :::* LISTEN 24934/master
The contents of master.cf:
#
# Postfix master process configuration file. For details on the format
# of the file, see the master(5) manual page (command: "man 5 master").
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type private unpriv chroot wakeup maxproc command + args
# (yes) (yes) (yes) (never) (100)
# ==========================================================================
smtp inet n - - - - smtpd -o smtpd_sasl_auth_enable=yes
#smtp inet n - - - 1 postscreen
#smtpd pass - - - - - smtpd
#dnsblog unix - - - - 0 dnsblog
#tlsproxy unix - - - - 0 tlsproxy
submission inet n - - - - smtpd
# -o syslog_name=postfix/submission
# -o smtpd_tls_security_level=encrypt
# -o smtpd_sasl_auth_enable=yes
# -o smtpd_client_restrictions=permit_sasl_authenticated,reject
# -o milter_macro_daemon_name=ORIGINATING
smtps inet n - - - - smtpd -o syslog_name=postfix/smtps -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes -o smtpd_client_restrictions=permit_sasl_authenticated,reject -o milter_macro_daemon_n$
#628 inet n - - - - qmqpd
pickup fifo n - - 60 1 pickup
cleanup unix n - - - 0 cleanup
qmgr fifo n - n 300 1 qmgr
#qmgr fifo n - n 300 1 oqmgr
tlsmgr unix - - - 1000? 1 tlsmgr
rewrite unix - - - - - trivial-rewrite
bounce unix - - - - 0 bounce
defer unix - - - - 0 bounce
trace unix - - - - 0 bounce
verify unix - - - - 1 verify
flush unix n - - 1000? 0 flush
proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp unix - - - - - smtp
relay unix - - - - - smtp
# -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq unix n - - - - showq
error unix - - - - - error
retry unix - - - - - error
discard unix - - - - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - - - - lmtp
anvil unix - - - - 1 anvil
scache unix - - - - 1 scache
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent. See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
maildrop unix - n n - - pipe
flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
#
# ====================================================================
#
# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
#
# Specify in cyrus.conf:
# lmtp cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
#
# Specify in main.cf one or more of the following:
# mailbox_transport = lmtp:inet:localhost
# virtual_transport = lmtp:inet:localhost
#
# ====================================================================
#
# Cyrus 2.1.5 (Amos Gouaux)
# Also specify in main.cf: cyrus_destination_recipient_limit=1
#
#cyrus unix - n n - - pipe
# user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
#
# ====================================================================
# Old example of delivery via Cyrus.
#
#old-cyrus unix - n n - - pipe
# flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
#
# Other external delivery methods.
#
ifmail unix - n n - - pipe
flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp unix - n n - - pipe
flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix - n n - 2 pipe
flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman unix - n n - - pipe
flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
${nexthop} ${user}
submission inet n - - - - smtpd -o smtpd_sasl_auth_enable=yes
smtp-14128634181497 unix - - - - - smtp -o smtp_bind_address=XXX.XXX.XXX.XX
