Problem solved. It was because of SELinux: # setsebool -P httpd_can_network_connect on On Saturday, March 6, 2021, 10:11:27 PM GMT+3:30, Jason Long <hack3rcon@xxxxxxxxx.invalid> wrote: Thanks. On VM1, I used VirtualBox Port Forwarding: Protocol Host IP Host Port Guest IP Guest Port TCP 127.0.0.1 2080 10.0.3.15 80 When I enter "127.0.0.1:2080" in my browser, then logs on VM1 are: # cat access_log 10.0.3.2 - - [06/Mar/2021:22:03:01 +0330] "GET / HTTP/1.1" 503 299 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36" 10.0.3.2 - - [06/Mar/2021:22:03:01 +0330] "GET /favicon.ico HTTP/1.1" 503 299 "http://127.0.0.1:2080/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36" # cat error_log [Sat Mar 06 22:03:01.275035 2021] [proxy:error] [pid 851:tid 1036] (13)Permission denied: AH00957: HTTP: attempt to connect to 192.168.1.4:80 (192.168.1.4) failed [Sat Mar 06 22:03:01.275093 2021] [proxy_http:error] [pid 851:tid 1036] [client 10.0.3.2:33820] AH01114: HTTP: failed to make connection to backend: 192.168.1.4 [Sat Mar 06 22:03:01.320469 2021] [proxy:error] [pid 850:tid 990] (13)Permission denied: AH00957: HTTP: attempt to connect to 192.168.1.4:80 (192.168.1.4) failed [Sat Mar 06 22:03:01.320528 2021] [proxy_http:error] [pid 850:tid 990] [client 10.0.3.2:33822] AH01114: HTTP: failed to make connection to backend: 192.168.1.4, referer: http://127.0.0.1:2080/ On VM2: # cat access_log # # cat error_log # On Saturday, March 6, 2021, 07:14:09 PM GMT+3:30, Eric Covener <covener@xxxxxxxxx> wrote: > Service Unavailable > The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later. > > Why? What do both error_logs say? --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx