We help IT Professionals succeed at work.
Get Started

Forefront TMG 2010 Blocking Internet Connectivity on the LAN

Last Modified: 2012-05-15
After migrating to Forefront TMG 2010, it ran smoothly over the weekend without a problem, on Monday, around midday, I got an error in the alert “Concurrent TCP Connections from one IP Address Limit Exceeded”. Both my DNS servers had been blocked in this alert and as a result there was no name resolution and this no internet connectivity for my whole office. I would also got this error on ISA 2006, but it would not block internet connectivity like in the case of Forefront. I have also (in both firewalls) put both my internal DNS servers in the IP Exceptions list of the Flood Mitigation settings so as to allow the highest threshold of concurrent TCP connections allowed. The server on which I installed Forefront was different from the one running ISA, and it was also fairly new and so I don’t think there is an issue with the NICs. Kindly advise what I can do to resolve this problem
Watch Question
ICT Manager
This problem has been solved!
Unlock 1 Answer and 11 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE