This Internal Server Error 43531 is a very specific error code that is almost exclusively associated with Citrix NetScaler or Citrix Gateway.
You are likely seeing this error when trying to logging into a School Portal, Work Remote Desktop, or a Banking/Corporate website that uses Citrix for security.
It is not a standard error for games like Roblox or Valorant.
What it Means
The server you are trying to reach (the StoreFront) is rejecting your connection request, usually because of a browser mismatch or a “Referer Header” issue.
How to Fix It (As a User)
Since you are likely a user trying to access a site, try these steps in order:
Use “Incognito” or “Private” Mode
Open your browser (Chrome/Edge/Safari).
Press Ctrl + Shift + N (or Cmd + Shift + N on Mac).
Try logging in again. This bypasses the “bad” cookies causing the 43531 error.
Clear Your Browser Cache
If Incognito worked, you need to clear your main browser’s data.
Go to History > Clear Browsing Data.
Select “Cookies and other site data” and “Cached images and files.”
Restart the browser and try again.
Try a Different Browser
If you are using Chrome, try Firefox or Edge.
This error is sometimes triggered by a specific update in Chrome that handles security headers differently than the Citrix server expects.
Are you using a Bookmark?
Do not use an old bookmark. The error often happens because the bookmark links to an expired session URL.
Type the main website address manually (e.g.,
remote.company.com) and log in fresh.
Also Read : The Division 2 Mike 01 Error | Easy Fix
If You Are the Administrator (Setting up a Server)
If you are the one hosting this site (e.g., for your CS project), this is a known bug in NetScaler builds (specifically related to the “Referer” header in Session Policies).
Fix: You need to update your Session Policy expression.
Change:
REQ.HTTP.HEADER Referer EXISTSTo:
HTTP.REQ.HEADER("User-Agent").CONTAINS("CitrixReceiver")
Be the first to comment