(OS 10048)Only one usage of each socket address (protocol/network address/port) is normally permitted

Hi,

I have the above error on windows:
+++
[Fri Feb 07 08:46:33.110167 2025] [proxy:debug] [pid 7440:tid 1168] 
mod_proxy.c(1465): [client ::1:56280] AH01143: Running scheme balancer 
handler (attempt 0)
[Fri Feb 07 08:46:33.110167 2025] [proxy_ajp:debug] [pid 7440:tid 1168] 
mod_proxy_ajp.c(790): [client ::1:56280] AH00895: serving URL 
ajp://[0:0:0:0:0:0:0:1]/
[Fri Feb 07 08:46:33.110167 2025] [proxy:debug] [pid 7440:tid 1168] 
proxy_util.c(2797): AH00942: AJP: has acquired connection for 
(0:0:0:0:0:0:0:1:8009)
[Fri Feb 07 08:46:33.110167 2025] [proxy:debug] [pid 7440:tid 1168] 
proxy_util.c(3242): [client ::1:56280] AH00944: connecting 
ajp://[0:0:0:0:0:0:0:1]/ to 0:0:0:0:0:0:0:1:8009
[Fri Feb 07 08:46:33.110167 2025] [proxy:debug] [pid 7440:tid 1168] 
proxy_util.c(3450): [client ::1:56280] AH00947: connecting / to 
[::1]:8009 (0:0:0:0:0:0:0:1:8009)
[Fri Feb 07 08:46:33.110167 2025] [proxy:error] [pid 7440:tid 2552] (OS 
10048)Only one usage of each socket address (protocol/network 
address/port) is normally permitted.  : AH00957: AJP: attempt to connect 
to [::1]:8009 (0:0:0:0:0:0:0:1:8009) failed
[Fri Feb 07 08:46:33.110167 2025] [proxy:error] [pid 7440:tid 2552] 
AH00959: ap_proxy_connect_backend disabling worker for 
(0:0:0:0:0:0:0:1:8009) for 60s
[Fri Feb 07 08:46:33.110167 2025] [proxy_ajp:error] [pid 7440:tid 2552] 
[client ::1:49653] AH00896: failed to make connection to backend: 
0:0:0:0:0:0:0:1
[Fri Feb 07 08:46:33.110167 2025] [proxy:debug] [pid 7440:tid 2552] 
proxy_util.c(2813): AH00943: AJP: has released connection for 
(0:0:0:0:0:0:0:1:8009)
+++

Does that ring bell to someone? I am using 2.4.x and my own build on 
windows (windows server 2019)

-- 
Cheers

Jean-Frederic