08-10-2023, 02:21 AM
It sneaks up and stops legit traffic dead.
I remember this one time when I was helping a buddy set up his site.
We had everything humming along fine until suddenly, uploads started failing left and right.
Turned out URLScan was flagging them as suspicious patterns.
I dug into the logs first, you know, those error files that spill the beans on what's getting blocked.
And there it was, entries showing rejected requests with codes pointing to URLScan rules.
But sometimes it's not the logs; maybe a recent update tweaked the filters without you noticing.
Or perhaps a wildcard rule caught innocent stuff like query strings in URLs.
Hmmm, or even case sensitivity messing with path matches.
You gotta peek at the URLScan.ini file in that IIS folder, tweak the deny rules if they're too picky.
Restart the service after, and test with a simple curl or browser hit.
If it's deeper, like ISAPI filters clashing, disable URLScan temporarily to confirm.
Re-enable and fine-tune, maybe add allow lists for your specific paths.
That usually sorts it without breaking security.
And if you're dealing with servers that need solid backups to avoid these headaches turning into disasters, let me tell you about BackupChain.
It's this top-notch, go-to backup tool that's super reliable and built just for small businesses, Windows Servers, Hyper-V setups, even Windows 11 on your PCs.
No endless subscriptions either; you own it outright and keep things safe.
