{"id":605,"date":"2015-09-13T08:49:05","date_gmt":"2015-09-13T07:49:05","guid":{"rendered":"http:\/\/www.netexpertise.eu\/fr\/?p=605"},"modified":"2021-05-23T08:08:46","modified_gmt":"2021-05-23T07:08:46","slug":"proxy-apache-permission-refusee-503","status":"publish","type":"post","link":"http:\/\/www.netexpertise.eu\/fr\/systeme\/linux\/proxy-apache-permission-refusee-503.html","title":{"rendered":"Reverse Proxy Apache Permission Refus\u00e9e Erreur 503"},"content":{"rendered":"\n

Apache<\/a> configur\u00e9 en tant que reverse proxy transf\u00e8re les requ\u00eates au backend web. Seulement, votre navigateur s’obstine \u00e0 renvoyer une erreur 503: \u201cService temporairement indisponible<\/em>\u201d

<\/p>\n\n\n\n

\"503<\/figure><\/div>\n\n\n\n



La premi\u00e8re chose que je fais est de jeter un oeil aux logs HTTP dans \/var\/log\/httpd\/ssl_error_log, o\u00f9 je d\u00e9couvre une erreur de droit:
(13)Permission denied: proxy: HTTP: attempt to connect to 192.168.1.250:8080 (*) failed<\/em>

L’erreur peut aussi se manifester par des:
AH01114: HTTP: failed to make connection to backend<\/em>

Si SELinux<\/a> est activ\u00e9 sur votre syst\u00e8me, c’est probablement la source du probl\u00e8me. SELinux interdit Apache de cr\u00e9er des connexions vers l’ext\u00e9rieur. Vous pouvez le v\u00e9rifier en le d\u00e9sactivant temporairement dans \/etc\/selinux\/config. Un reboot est n\u00e9cessaire ensuite.

si c’est confirm\u00e9, r\u00e9activez SELinux pour garrder un niveau de s\u00e9curit\u00e9 \u00e9lev\u00e9, et ajoutez la r\u00e8gle d’exception:<\/p>\n\n\n\n

$ sudo setsebool -P httpd_can_network_connect 1<\/code><\/pre>\n\n\n\n

Cette varriable permet aux processus et modules HTTPD de se connecter au r\u00e9seau. Il existe d’autres variables bool\u00e9ennes ajoutant des restrictions \u00e0 HTTPD. Pour les lister, ex\u00e9cutez getsebool -a | grep httpd<\/em>.
Vous trouverez des variables int\u00e9ressantes dans cette liste comme:
– httpd_can_network_connect_db (off par d\u00e9faut)
– httpd_enable_ftp_server (off par d\u00e9faut)
– httpd_enable_cgi (on par d\u00e9faut)
etc…

L’option -P permet de rendre les changements persistants au boot. Vous devrez \u00e9ventuellement relancer Apache<\/p>\n\n\n\n
$ sudo \/etc\/init.d\/httpd restart<\/code><\/pre>\n\n\n\n

Cette erreur est connue et document\u00e9e sur le site d’Apache<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Apache configur\u00e9 en tant que reverse proxy transf\u00e8re les requ\u00eates au backend web. Seulement, votre navigateur s’obstine \u00e0 renvoyer une erreur 503: \u201cService temporairement indisponible\u201d La premi\u00e8re chose que je fais est de jeter un oeil aux logs HTTP dans \/var\/log\/httpd\/ssl_error_log, o\u00f9 je d\u00e9couvre une erreur de droit:(13)Permission denied: proxy: HTTP: attempt to connect to […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[6,10],"tags":[406,407,420],"yoast_head":"\nNetexpertise - Reverse Proxy Apache Permission Refus\u00e9e Erreur 503<\/title>\n<meta name=\"description\" content=\"Votre navigateur affiche une erreur 503 quand vous vous connectez \u00e0 un site web via un reverse proxy Apache? 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