Hi Jochen,
Does this kernel by any chance have the USAGI patches applied? I'm running cyrus21-imapd for a while on an IPv6 machine without any problems (and providing service to both IPv4 and IPv6).
What does "cat /proc/sys/net/ipv6/bindv6only" tell you? Does it help to set this variable to 0 before starting cyrmaster?
No there are no USAGI patches applied. And /proc/sys/net/ipv6/bindv6only is 0. The interesting point about it is, that several other services (postfix, ssh, apache2) are bound only to IPv6 and work just fine on both IPv6 and IPv4. Just when trying to connect to port 993 or 143 I get 'Connection refused'.
I attach my 'netstat -lpn' for details.
Michael
--
base:~# netstat -lpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:515 0.0.0.0:* LISTEN 689/lpd
tcp 0 0 0.0.0.0:997 0.0.0.0:* LISTEN 818/rpc.mountd
tcp 0 0 0.0.0.0:712 0.0.0.0:* LISTEN 954/rpc.statd
tcp 0 0 127.0.0.1:10024 0.0.0.0:* LISTEN 610/amavisd (master
tcp 0 0 127.0.0.1:10025 0.0.0.0:* LISTEN 910/master
tcp 0 0 0.0.0.0:139 0.0.0.0:* LISTEN 928/smbd
tcp 0 0 127.0.0.1:783 0.0.0.0:* LISTEN 616/spamd.pid
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 456/portmap
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 974/(squid)
tcp 0 0 0.0.0.0:113 0.0.0.0:* LISTEN 669/inetd
tcp 0 0 0.0.0.0:3128 0.0.0.0:* LISTEN 974/(squid)
tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN 529/named
tcp 0 0 0.0.0.0:445 0.0.0.0:* LISTEN 928/smbd
tcp6 0 0 :::993 :::* LISTEN 656/cyrmaster
tcp6 0 0 :::143 :::* LISTEN 656/cyrmaster
tcp6 0 0 :::80 :::* LISTEN 619/apache2
tcp6 0 0 :::53 :::* LISTEN 529/named
tcp6 0 0 :::22 :::* LISTEN 943/sshd
tcp6 0 0 :::25 :::* LISTEN 910/master
tcp6 0 0 ::1:953 :::* LISTEN 529/named
[..]
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