I have been doing a little more testing.. debugging..

When the login button at the top of the default theme is used to login (java script) window opens for the login..
This version of login returns a blank portal..

If the normal login is used..  index.php?action=login  .. no javascript window
Then the login works as it should do showing the portal..

If the 'user info' block in the portal is active and used for the login..
Then the login works as it should do showing the portal..

Hope this helps to narrow the problem down..

the log in Problem still remains..

after login, the index remains blank, it does not show the Portal or the forum

as if the "action" on index or home do not get applyed..

for example as if the set location does not get called

   $setLocation = 'index.php?action=forum';

i have found the code.. in the PortalHooks.php that controls the Home and Forum Buttons
on line 1910 - 1946  comented these lines out..

and my inseted buttons in home and forum works as per Subs.php

i have been doing some more testing...
the menu bottons that are mainly involved are the "Home" and "Forum" buttons..

the Home button; sub buttons don't appear when edited in the Sub.php
the Forum button; manual edit, to place the button 4th from left

after the 1.40.2 install the forum button appears 2nd from left..

all other manual edited (or insterted) buttons in subs.php after the home and forum buttons, work as expeted

Quote from: Chen Zhen on March 28, 2026, 07:29:25 PMDon't forget that it's just the condition that is applied because the socket path will be different.

I don't understand any of it Chen it's way above my comprehension, all I was doing was trying to see if the link you posted was what I found   

That's the second example in what I posted.
I used the ProxyErrorOverride option but might change it to what you just posted. Don't forget that it's just the condition that is applied because the socket path will be different.
One just needs to surround the SetHandler path with the condition.

I've set my VPN to Canada and clicked on your link but it ends up with the same result as my previous post.

However I think it might be to do with the fact that your link is Google based. So what I did was copy the text of the link and then pasted that into my browser address bar and the result was as per the attached.

I'm not sure if that's the response you expected from your original link or not

Yes this happens on the default theme as well, it happens on any theme..

It's a Manuel edit in the subs.php

With the 1.39.8 portal installed all the menu buttons are there..

My firewall is blocking the use of any VPN or online proxy..
I might try a plug-in but in a browser that I don't normally use because I don't like 3rd party stuff filtering sensitive data (ie. bank, government sites, etc.).

Here is a stackoverflow link that more or less contains the same information:
https://stackoverflow.com/questions/25801695/apache-2-4-php-fpm-catching-error-pages

IMO it's strange behavior.. perhaps something to do with region restrictions?
If you're curious, you can try using a proxy or VPN that spoofs a Canadian IP to see if it works.
This has got me curious.. I may try spoofing the US or UK to see if it doesn't work.