... I need the subsite urls to remain as https://slave.mainsite.com and not revert to https://mainsite.com/slave as it would with a subdomain redirect in cpanel.


Slave site homepage will be like https://slave.mainsite.com, cpanel's subdomain should use same documents folder as master site ...

... I need the subsite urls to remain as https://slave.mainsite.com and not revert to https://mainsite.com/slave as it would with a subdomain redirect in cpanel.

How many sites is too many? I’m anticipating up to 50 subdomains at any one time. I also plan to use rsform pro on each subsite to ...

Here is sample config part:

location / {
if ($request_filename ~ /phpBB3(.?)$){
rewrite ^(.*)$ /forum redirect;
}
if ($request_filename ~ /phpBB3/index.php){
rewrite ^(.*)$ /forum?$query_string redirect;
}
if ($request_filename ~ /phpBB3/ucp.php){
rewrite ^(.*)$ /forum/user?$query_string ...

... best to wait.

About Direct Alias Pro: I opened the plugin now to check actually. And as I understand it, maybe I should still keep it because it redirects old URLs!
I've read complaints about the new router in Joomla because people are saying it does not redirect old URLs.

My enabled settings in ...

... are the steps I took for a successful move :
1) Disable all jFusion MODS for phpbb, using the jFusion configuration panel for the pbpBB plugin (redirect MOD, dual login MOD, frontend moderator panel MOD)
2) Disable the jFusion plugin itself (master button on the main page of the jFusion component ...

It comes from that shortening. The canonical wouldn't be needed if 301 redirect would be used but it's not.

The site is configured to use short urls via Direct Alias Pro, so the content is linked by domain.xy/id_nr.

This is the way how the content is linked from articles and how are linked the ...

That is if you have second domain, if not canonical links are not presented at all - but they should be or they should use 301 redirect.

The solution would be probably same like in previous case. I will try to test it on some new joomla installation.

Its possible to run under forum.test.at ?
I see its better when I make a redirect from my websitenameforum. at to -> forum. test. at

... and phpBB is displayed as it is. Full version loads phpBB inside Joomla with custom SEF URLs, as a result not all phpBB extensions will work.

If you need simple level of integration, it's better to use light version. Note that you can easily redirect phpBB login and redirect URLs via .htaccess.