Dovecot 2.0.x: Error: service(pop3-login): listen(::, 110) failed: Address family not supported by protocol


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Dovecot 2.0.x: Error: service(pop3-login): listen(::, 110) failed: Address family not supported by protocolLast Modified: Jan 19, 2011, 10:47 pm
If you see this error after Dovecot 2.0.x was installed:

Error: service(pop3-login): listen(::, 110) failed: Address family not supported by protocol
Error: socket() failed: Address family not supported by protocol
Error: service(pop3-login): listen(::, 995) failed: Address family not supported by protocol
Error: socket() failed: Address family not supported by protocol
Error: service(imap-login): listen(::, 143) failed: Address family not supported by protocol
Error: socket() failed: Address family not supported by protocol
Error: service(imap-login): listen(::, 993) failed: Address family not supported by protocol
Fatal: Failed to start listeners

it means that Dovecot is trying to bind to an IPv6 interface, but your system doesn't support IPv6.  The solution is to tell Dovecot to only listen on an IPv4 interface.  You can do this by adding the following to the very top of your /etc/dovecot.conf file

listen = *

The internal default is

listen = *, ::

where the :: is the IPv6 part, hence you don't want to use that in this case.

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