Cisco Ceases Support for Multi-Vendor Site to Site VPNs

We always knew that different VPN gateway vendors went out of their way to loosely interpret RFC in order to lock out other VPN gateway vendors, so that customers would have to buy the same vendor’s VPN gateway for each office. Among the vendors that seemed to go to out of their way in this area is Cisco.

Well, they decided to completely close the door on interoperability this month — so if you want to connect your ISA firewall VPN gateway to an ASA, then you’re going to have to do it without Cisco’s help or support.

For more information, check out Joe Harris’ blog post here:

(Many thanks to Adrian Dimcev from for pointing out this issue)



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Your email address will not be published.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