Hi, I'm the original reporter. I've just make a fresh install of httpd-2.4.32-Win64-VC15.zip <https://www.apachelounge.com/download/VC15/binaries/httpd-2.4.32-Win64-VC15.zip>
And then uncommented the following modules: lbmethod_byrequests_module proxy_module slotmem_shm_module And in the #Virtual hosts section added the following: <VirtualHost *:80> ServerAdmin webmas...@dummy-host.example.com DocumentRoot "C:/Apache24/docs/dummy-host.example.com" ServerName dummy-host.example.com ServerAlias www.dummy-host.example.com ErrorLog "logs/dummy-host.example.com-error.log" CustomLog "logs/dummy-host.example.com-access.log" common LogLevel debug <Proxy balancer://mycluster> BalancerMember http://localhost:8080 retry=0 BalancerMember http://localhost:8880 retry=0 status=+H </Proxy> ProxyPass / "balancer://mycluster/" ProxyPassReverse / "balancer://mycluster/" </VirtualHost> You get the same error in the log: [proxy_balancer:debug] [pid 23672:tid 520] mod_proxy_balancer.c(917): AH01178: Doing balancers create: 552, 1 (6) [proxy_balancer:debug] [pid 23672:tid 520] mod_proxy_balancer.c(986): AH01184: Doing workers create: balancer://mycluster (pfbbe1180_mycluster), 984, 2 [0] [proxy_balancer:debug] [pid 29888:tid 544] mod_proxy_balancer.c(917): AH01178: Doing balancers create: 552, 1 (6) [proxy_balancer:emerg] [pid 29888:tid 544] (17)File exists: AH01179: balancer slotmem_create failed -- Sent from: http://apache-http-server.18135.x6.nabble.com/Apache-HTTP-Server-Dev-f4771363.html