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503 service unavailable error on webserver

AaronOsmer
Recently I have been getting the occasional 503 error on my web server. It seems to be an issue with the UTM Webserver protection, as when I go to the website locally by the server ip address everything is fine. This is a sporadic issue, and happens probably 1 out of 5 times going to the site.

Below is the error log from the Web Application Firewall: 

2013:08:07-23:25:07 aaronosmer reverseproxy: [Wed Aug 07 23:25:07.643266 2013] [proxy_http:error] [pid 29692:tid 3771476848] [client 192.168.1.113:52942] AH01114: HTTP: failed to make connection to backend: 192.168.1.105

2013:08:07-23:25:07 aaronosmer reverseproxy: srcip="192.168.1.113" localip="67.208.246.42" size="299" user="-" host="192.168.1.113" method="GET" statuscode="503" reason="-" extra="-" time="542413" url="/" server="aaronosmer.com" referer="-" cookie="__qca=P0-1376052782-1372293515072; wp-settings-1=imgsize%3Dfull%26libraryContent%3Dbrowse%26hidetb%3D1%26editor%3Dhtml%26unfold%3D1; wp-settings-time-1=1372442912; HASH_wp-settings-1=AAE07720C182D3DEF6AB419F1FFD3B2BBADF22B0; HASH_wp-settings-time-1=E4D241FB1FC6812690542663580577D64634DE7D; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_c19698171485f7b7a8f4466d9567cab2=admin%7C1376102452%7Ca60962657b1fd2178bf098c36c1a5f60; HASH_wordpress_test_cookie=0B1E1B59E104C7C8C536A09E426817341C3F2053; HASH_wordpress_logged_in_c19698171485f7b7a8f4466d9567cab2=175B60AEE1115FD7B542D44831F040107578B381" set-cookie="-"

2013:08:07-23:25:08 aaronosmer reverseproxy: [Wed Aug 07 23:25:08.511672 2013] [proxy:error] [pid 29692:tid 3763084144] (111)Connection refused: AH00957: HTTP: attempt to connect to 192.168.1.105:80 (192.168.1.105) failed

2013:08:07-23:25:08 aaronosmer reverseproxy: [Wed Aug 07 23:25:08.511707 2013] [proxy:error] [pid 29692:tid 3763084144] AH00959: ap_proxy_connect_backend disabling worker for (192.168.1.105) for 60s

2013:08:07-23:25:08 aaronosmer reverseproxy: [Wed Aug 07 23:25:08.511719 2013] [proxy_http:error] [pid 29692:tid 3763084144] [client 192.168.1.113:52945] AH01114: HTTP: failed to make connection to backend: 192.168.1.105

2013:08:07-23:25:08 aaronosmer reverseproxy: srcip="192.168.1.113" localip="67.208.246.42" size="299" user="-" host="192.168.1.113" method="GET" statuscode="503" reason="-" extra="-" time="310687" url="/favicon.ico" server="aaronosmer.com" referer="-" cookie="__qca=P0-1376052782-1372293515072; wp-settings-1=imgsize%3Dfull%26libraryContent%3Dbrowse%26hidetb%3D1%26editor%3Dhtml%26unfold%3D1; wp-settings-time-1=1372442912; HASH_wp-settings-1=AAE07720C182D3DEF6AB419F1FFD3B2BBADF22B0; HASH_wp-settings-time-1=E4D241FB1FC6812690542663580577D64634DE7D; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_c19698171485f7b7a8f4466d9567cab2=admin%7C1376102452%7Ca60962657b1fd2178bf098c36c1a5f60; HASH_wordpress_test_cookie=0B1E1B59E104C7C8C536A09E426817341C3F2053; HASH_wordpress_logged_in_c19698171485f7b7a8f4466d9567cab2=175B60AEE1115FD7B542D44831F040107578B381" set-cookie="-"


Thanks for the help!
-Aaron


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