I cannot reproduce your issue on a fresh/clean install of current versions of everything. Have you tried removing your customized server redirects, or restoring your server settings to their defaults? Have you tried updating your versions? It could be possible that any issue you are experiencing now, has been resolved in a newer (currently supported) version.

The following is what I tested with. Zero issues presented themselves. Everything continues to work as expected. No code changes or redirection tricks used or needed.

FRESH INSTALL OF:
Windows 10 Pro version 1909
Internet Information Services 10.0 (IIS/10)
PHP 7.4.11
MySQL 5.7.31
UBB.threads 7.7.4 (installed to ROOT of localhost)



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I noticed a few things about your issue that stand out as unnatural:

1. On 2020-09-29, you were running php 7.4.11.
A pre-release version of PHP?
PHP version 7.4.11 was released on 2020-10-01.
source: https://www.php.net/archive/2020.php#2020-10-01-3

2. You are using Windows Server 2012 with IIS/8.0.
Any reason why you dont update to at least WIndows Server 2012 R2 with IIS/8.5?
Windows Server 2012 Mainstream support ended on October 9, 2018.
https://docs.microsoft.com/en-us/iis/get-started/whats-new-in-iis-85/enhanced-logging-for-iis85
or the current version, Windows Server 2019 with IIS/10?
https://docs.microsoft.com/en-us/ii...iis-10/new-features-introduced-in-iis-10

You're running the bleeding edge version of PHP, so new that it wasnt even officially released at the time you were running it, but are doing it on web server version that has reached end of support several years ago (2018).

Either of these could be related to the cause of your problem. Though, i believe your main issue is the custom url redirects you've created.
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