Clearing the ISA Firewall’s Web Cache

We’d been having some troubles with caching recently and part of our troubleshooting process was clearing the ISA firewall’s Web cache. Since I had to go through this recently, I thought I’d share with you how to do that:

  • On the ISA firewall , stop the Microsoft Firewall service:
    1. Click Start, click Run, enter services.msc in the Open text box, and then click OK.
    2. Right-click Microsoft Firewall, and then click Stop.
  • Start Windows Explorer.
  • Locate the Urlcache folder, which is typically on the C: drive unless you chose another location or set of locations.
  • In the Urlcache folder, locate the file that has the .cdat file name extension.
  • Right-click the .cdat file, and then click Delete.
  • image

  • When you are prompted to confirm the removal of the .cdat file, click Yes. If you are prompted to delete the .cdat file because it is too big for the Recycle Bin, click Yes.
  • Restart the Microsoft Firewall service
  • That’s all there is to it. Make sure that you do this when you don’t have a lot of users connecting through the ISA firewall. Otherwise, expect your phone to start ringing



    Thomas W Shinder, M.D., MCSE
    Sr. Consultant / Technical Writer

    Prowess Consulting

    PROWESS CONSULTING | Microsoft Forefront Security Specialist
    Email: [email protected]
    MVP — Forefront Edge Security (ISA/TMG/IAG)

    About The Author

    Leave a Comment

    Your email address will not be published. Required fields are marked *

    This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

    Scroll to Top