Issue: Forum.php stopped working

Update: I removed all new namespaces, re-enabled the wiki, got the same error. Disabling Vaultwiki under VaultWiki: Server Settings allows the forums to work. :/

If you recently upgraded PHP on your server, was PHP compiled with the mbstring extension? If not, check VaultWiki: Server Settings, and make sure UTF-8 support is turned off.

Just for good measure, I disabled utf-8 support for urls in vw: server settings, still got the error.

Any other possibilities?

Have you run the VaultWiki upgrade script since updating to vB 4.2? If you haven't, you need to run the script. It will rebuild some things that the vB upgrade might have broken.

Do PHP errors normally display out to your browser? If not, try turning on display_errors in your php.ini file, or add the following code after the copyright block in forum.php:
HTTP 400 Bad Request implies that either:
1. the browser requested a URL from your server that the server doesn't know how to handle, or
2. the server isn't sending a valid HTTP 200 response and other types of error reporting are currently turned off or unavailable for the content being requested.

I haven't upgraded VB, I merely added namespaces.

I'll add that and report back.

Ah hah! I can adjust this. Thank you for the help troubleshooting!!

Bumped from 128 to 196 memory allowed in php.ini, forums now work.

Thank you

That's a really long plugin (50k lines), or you have a lot of products installed. You may want to review.

I guess I'm not following. I only added namespaces, no plugins or new products.

If you added new namespaces, it would increase the memory requirement somewhat, but not by much. Unless you added hundreds of new namespaces, or if you already have hundreds of sub-forums, you were probably already close to your memory limit before adding the extra namespaces.

According to the error message you posted, just one of your plugins (products have lots of plugins put together) has just under 50,000 lines of code. That is a red flag. I would try to track down the plugin that is that long and improve it or remove it. By comparison, most VaultWiki plugins are between 4 and 10 lines long.

EDIT: Some more info...

If your vB version is 4.2.0, class_core.php ~ line 4623 is the hook template_render_output, so if you have any products using that hook, you might want to start looking there. If your vB version is < 4.2.0, it's possible the line is the actual rendering of the template output, in which case, you would be looking for very long templates that are likely to be used on forum.php.

Either way, if you added multiple namespaces and they all have hundreds of thousands of articles in them, that might have an effect on performance if all the namespaces appear together in the forum list on forum.php. In this case, you might want to hide the wiki namespaces from the forum bits and just rely on the Wiki tab, or you may want to show only one forum that has a Forum Link to the Wiki tab.

I haven't upgraded to 4.2 yet, I am still at 4.1.11. We don't have much in the wiki, so we don't have the hundreds of thousands of pages yet.

It could be as simple as how I have the wiki forums/namespaces configured. Please see the attached screenshot. I would like to hide them all, regular members should really have no need to see the forums, only staff (and that's a maybe). How would you recommend I hide them from view?

In your Forum Manager, set the "Wiki Forums" item to Display Order = 0. This will hide them all from your forum home.

Thank you