SOLVED webmail proxy seems not to work on only one domain : redirects to https://www.DOMAINE.TLD/___proxy_subdomain_webmail/ +bad layout

[Markif]

Hello,
we have a problem on 1 site on a server.
The other sites proxy good when asking webmail.DOMAIN.TLD
but one site it does not work, it rederects to https://www.DOMAINE.TLD/___proxy_subdomain_webmail/
and the layout is mixed up.
I verifyed the DNS as could not find problems, the settings seems the same...
I verifyed the http.conf file, and there also the config seems the same for the different domains.
There are no directives in /etc/apache2/conf.d/userdata/ssl/2_4/ that concern that domain.
Server runs v98.0.8 with cloudlinux OS+ and cage FS.
Has already be done with no succes :
# /usr/bin/selectorctl --apply-global-php-ini
# /usr/sbin/cagefsctl --apply-global-php-ini
# cagefsctl --force-update
# cagefsctl --rebuild-alt-php-ini
# /scripts/rebuildhttpdconf
# service httpd restart
Has someone a suggestion what can be the problem ?
Thanks for your help, Best regards,
Yves

 

[Markif]

PS : looking at

In Progress - [CPANEL-30925] /webmail redirect

Hello, I have a little problem with my whm/cpanel. When i'm trying to use domain.com/webmail it takes about 5-10 sec to redirect. in the left corner i have Cpanel is connecting and in the right corner i have some messeges : first it says preferred, then proxy, then nonsecure, then nonsecure...

forums.cpanel.net

I've put "Use X-Frame-Options and X-Content-Type-Options headers with cpsrvd [?]" to no
But tjos gives no change

 

[cPRex]

Hey there! It sounds like you've already checked all the common issues that could cause this. Could you submit a ticket to our team so we can check this out directly on your server? Once you've done that, just post the ticket number here so I can follow along.

 

[Markif]

@cPRex
Ticket number #94370691

 

[cPRex]

Thanks for that - I'm following along with the ticket on my end now.

 

[cPRex]

I see Austin was able to get you some good details about one of the Apache includes causing a conflict with the webmail redirect.

 

[Markif]

@cPRex

Hello,

Yes indeed, support did find the problem in the custom configuration.
There was inside an include file
/etc/apache2/conf.d/userdata/std/2_4/<UNIX>/<SITE>/<INCLUDE>.conf
a rewrite rule for adding "www" to the domain name,

<ElseIf "req('Host') != 'www.DOMAIN.TLD'">
    RedirectMatch 301 (.*) https://www.DOMAIN.TLD$1
</ElseIf>

Due to the order of processing of Apache directives, the custom configuration was imposing on cPanel's default service subdomain configuration that resides in the same virtualhost block.
This has been changed in

<ElseIf "! %{HTTP_HOST} in { 'www.DOMAIN.TLD', 'cpanel.DOMAIN.TLD', 'webmail.DOMAIN.TLD', 'webdisk.DOMAIN.TLD', 'autodiscover.DOMAIN.TLD', 'cpcalendars.DOMAIN.TLD', 'cpcontacts.DOMAIN.TLD'  }">
    RedirectMatch 301 (.*) https://www.DOMAIN.TLD$1
</ElseIf>

to avoid interference with the CPANEL proxy rules.

In fact it was even an old rule for an alias domain that is not even present anymore, but was still present in the custom includes :-(.
So the lesson is that a regular review of these custom Apache includes is useful to not let there old configuration includes !

Big thanks for the help to solve this !
Yves