How does Apache access the application server? Is the ip address of application server changing (and it coincides with the 404 error)?
Deepak "The greatness of a nation can be judged by the way its animals are treated - Mahatma Gandhi" +91 73500 12833 deic...@gmail.com Facebook: https://www.facebook.com/deicool LinkedIn: www.linkedin.com/in/deicool "Plant a Tree, Go Green" Make In India : http://www.makeinindia.com/home On Wed, Jun 8, 2022 at 10:36 PM Yann Ylavic <ylavic....@gmail.com> wrote: > On Wed, Jun 8, 2022 at 3:21 PM Serge Krawczenko <skrawcze...@gmail.com> > wrote: > > > > We have application server behind httpd as a reverse proxy, > > with basic ldap auth, so only ldap authenticated users are able to get > into the application. > > ( Require valid-user > > Allow from all > > ) > > It's usually not a good idea to mix Require (httpd >= 2.4) and Allow > (httpd < 2.4) directives together, though I don't see how it could > lead to the symptoms you are seeing. > > > > > Everything works well and configuration is very basic. > > However, > > Sometimes like once in a month or two it fails and httpd stops acting > like a reverse proxy. > > I.e. https://url/my-app fails with 404 trying to find my-app locally. > > (the requested URL /my-app was not found on this server) > > If there are multiple VirtualHosts on the same IP:port in your server, > possibly some requests reach one with no "ProxyPass /my-app ..." > defined? > It may happen if an unknown Host/SNI is handled by the default vhost > for instance, but it wouldn't explain why all the following requests > go there (unless the app/something at some point starts redirecting to > a different URL). > > > > > It is 'fixed' by restarting httpd and is very annoying for users. > > > > Debug turned on for proxy and ldap modules and there's absolutely > nothing suspicious. > > When the situation occurs, there's just no attempt to refer to the > 'proxypass' it is > > just trying to get the local path immediately. > > > > It cannot be reproduced as well and there's no specific periodicity for > this failure. > > Anything i'm missing? Any more debug to turn on? > > Which httpd MPM and modules are used? It could be a non thread-safe > module running on a threaded MPM, corrupting some global state when > the load increases. > > > Regards; > Yann. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org > For additional commands, e-mail: users-h...@httpd.apache.org > >
