I found the problem - thanks to your (Amaury)  remark about the particular 
error message - :
The ubuntu service I was starting referred to the binary /usr/sbin/haproxy 
while the built binary was installed in /usr/local/sbin/haproxy.

Not the noble way, but I exchanged the old binary against the new one and the 
config file works.

Excuses for the confusion I have caused.

--
Christoph


> Am 08.11.2023 um 17:52 schrieb Amaury Denoyelle <adenoye...@haproxy.com>:
> 
> On Wed, Nov 08, 2023 at 04:42:00PM +0100, Christoph Kukulies wrote:
>> Christoph Kukulies
>> k...@kukulies.org
>> 
>> [...]
>> which leads to haproxy failing on startup:
>> Nov  8 16:38:28 mail haproxy[101582]: [ALERT]    (101582) : parsing 
>> [/etc/haproxy/haproxy.cfg:26] : 'bind' : unsupported protocol family 2 for 
>> address 'quic4@0.0.0.0:443'
>> So what can I do about it other than trusting upon the scripts and configs 
>> to work? Or ask here for help?
> 
> This particular error message "unsupported protocol family" has been
> removed in haproxy 2.6. Looks like you did not run the correct binary as
> this does not corresponds to the version reported by -vv. Have you
> ensure to run the binary directly on the command-line using an absolute
> path ?
> 
> -- 
> Amaury Denoyelle

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