I created web app pragmatically from c# using server object model, and on that web app I have created new host named site collection.

now when I try to open General settings in CA for that web app i get "Updates are currently disallowed on GET requests".

I used this powerShell command to fix that part:
$w = get-spwebapplication yourwebapplication
$w.HttpThrottleSettings
$w.Update()

but when I try to open site collection that I created on that web app i get this:

"Sorry, something went wrong
An unexpected error has occurred.
Technical Details
--------------------------------------------------------------
Go back to site"

When I create web app from powerShell script and site collection same as before I don't get any error and everything is working fine.

does someone have any idea how to fix problem with site collection?