Hello

We are using ISA 2006 server for managing internet for the users in our domain. Sometimes what happens is even we have internet but the internet is not working in the ISA 2006 server. Though we check the alerts if there is Concurrent connections from a particular ip or any attacks from the user or the service is properly running. we are not able to browse the internet for sometime or unknown reasons. If we restart the firewall the internet is working fine lets says the internet is working fine for 5 days and suddenly not working if we check the internet from internet service provider side its good. Why this happens??? Any solution or suggestion is welcomed.

Thanks

Regards

Raj (Subadee)

   

Hi,

>>Though we check the alerts if there is Concurrent connections from a particular ip or any attacks from the user or the service is properly running.

It seems that flood mitigation limits is exceeded. Please determine whether your network is being attacked, or whether there is simply a heavy load of valid traffic.

• If the malicious traffic appears to originate from the Internal network, this may indicate a virus on the Internal network. Identify the source IP address, and disconnect the computer from the network immediately.
• If the malicious traffic appears to originate from a small range of IP addresses on an External network, create a rule denying access to a computer set that includes the source IP addresses.
• If the traffic appears to originate from a large range of IP addresses, evaluate the overall status of your network. Consider setting a smaller connection limit, so that ISA Server can better protect your network.
• If the limit has been exceeded due to heavy load, consider setting a higher connection limit.

For more informationISA Server Network Protection: Protecting Against Floods and Attacks

Best Regards,

Joyce

Hello Joyce Thanks for the suggestion. I really appreciate that and one morething joyce we have this problem in the domain which we are using adsl internet connection. In other two domains we are having leased line internet connection there we don't face any issue like this. This problem is occurring in the adsl connection used domain. Any idea or suggestion on this joyce. Thanks Regards Raj