On Mon, Feb 24, 2025 at 09:53:24AM -0500, Wietse Venema via Postfix-users wrote:
> > I need some help in interpreting the following postfix log message,
> > please (this is showing up all over the log):
> >
> > `Feb 24 17:46:55 mail postfix/smtpd[77980]: fatal:
> > smtpd_peer_hostaddr_to_sockaddr: cannot convert client address/port to
> > string: Servname not supported for ai_socktype`
>
> The getaddrinfo(3) system library function cannot convert a (presumably
> numerical IP address and numerical port) for the socket type
> SOCK_STREAM into the internal form "struct addrinfo", and returns
> the EAI_SERVICE error code.
Given the address is from haproxy, perhaps haproxy is returning a host
address from a protocol famility (IPv4 or IPv6) that is not enabled in
Postfix. We'd then call getaddrinfo() with an address that is not
compatible with the protocol family in `hints`, perhaps eliciting a
less than clear error.
To that end, the OP should post the setting of inet_protocols in main.cf
and any overrides in master.cf, as well as some indication of the
address family of the problem incoming connections.
--
Viktor.
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