On 2022-08-19 23:09, Ionel GARDAIS wrote:
Aug 19 22:09:09 haproxy-2 haproxy[1280]: [WARNING]  (1280) : Failed to connect 
to the old process socket '/run/haproxy/admin.sock'
Aug 19 22:09:09 haproxy-2 haproxy[1280]: [ALERT]    (1280) : Failed to get the 
sockets from the old process!

There was a change in 2.6.0 (but not in 2.6.3) where "expose-fd listeners" for stats socket is not needed anymore. Is the line present in your configuration? (grep admin.sock /etc/haproxy/haproxy.cfg)

What's the output of systemctl cat haproxy?

Aug 19 22:09:09 haproxy-2 haproxy[1280]: [NOTICE]   (1280) : New worker (1282) 
forked
Aug 19 22:09:09 haproxy-2 haproxy[1280]: [NOTICE]   (1280) : Loading success.
Aug 19 22:09:09 haproxy-2 haproxy[1282]: [WARNING]  (1282) : Server bck-speedtest/go-v6 
is DOWN, reason: Layer4 connection problem, info: "Connection>
Aug 19 22:09:09 haproxy-2 haproxy[1282]: Server bck-speedtest/go-v6 is DOWN, reason: Layer4 
connection problem, info: "Connection refused", check dur>
Aug 19 22:09:09 haproxy-2 haproxy[1282]: Server bck-speedtest/go-v6 is DOWN, reason: Layer4 
connection problem, info: "Connection refused", check dur>
Aug 19 22:09:09 haproxy-2 haproxy[1282]: [WARNING]  (1282) : Server 
bck-nuxeo-arch/nuxeo-arch is DOWN, reason: Layer4 connection problem, info: "No 
r>
Aug 19 22:09:09 haproxy-2 haproxy[1282]: [ALERT]    (1282) : backend 
'bck-nuxeo-arch' has no server available!
Aug 19 22:09:09 haproxy-2 haproxy[1282]: Server bck-nuxeo-arch/nuxeo-arch is DOWN, reason: 
Layer4 connection problem, info: "No route to host", check>
Aug 19 22:09:09 haproxy-2 haproxy[1282]: Server bck-nuxeo-arch/nuxeo-arch is DOWN, reason: 
Layer4 connection problem, info: "No route to host", check>
Aug 19 22:09:09 haproxy-2 haproxy[1282]: backend bck-nuxeo-arch has no server 
available!
Aug 19 22:09:09 haproxy-2 haproxy[1282]: backend bck-nuxeo-arch has no server 
available!
[…] // others few backends not responding
// then

Are these expected?

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