[clug] Pop3 mail not working after dovecot update

Martijn van Oosterhout kleptog at svana.org
Thu Jun 26 09:23:11 GMT 2008

On Wed, Jun 25, 2008 at 06:53:15PM +1000, Sam Couter wrote:
> Martijn van Oosterhout <kleptog at svana.org> wrote:
> > That's not it. Any program opening an IPV6 socket for listening can
> > automatically receive IPV4 connections on the same socket.
> ipv6(7) agrees with you, but it doesn't match my experience. I've had to
> fix an SSH daemon to listen on IPv4 on a colleague's work machine while
> he was at home so he could connect after it decided to listen on IPv6 only.

I beleive the problem is usually that the firewall (deliberatly or not)
blocks ipv6 packets. If you have any kind of firewall that blocks
everything except stuff you know about, it's possible to be blocking
ipv6 without knowing it.

Here has some details:

You have to add a rule to you ipv4 firewall to allow ipv6 packets to
even be considered.

Have a nice day,
Martijn van Oosterhout   <kleptog at svana.org>   http://svana.org/kleptog/
> Please line up in a tree and maintain the heap invariant while 
> boarding. Thank you for flying nlogn airlines.
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