Array Member stopped responding, but was not dropped from NLB

We have had a standalone TMG array running for ~2 years now and recently had an issue come up we haven't seen before. Some users started complaining that all of our sites were unreachable. It would not even load the Forms Based Auth pages from the TMG server.
It would just spin, then time out. After investigation, it appeared 1 of the array members was not responding to requests, but was still in the NLB pool and trying to process requests.
The only symptoms I saw on the problematic array member were:
1- The servers was using 100% of the ram. They have 8GB allocated, and have never gone over 6GB.
2- There were 'Intrusion Detection' warnings about an all port scan attack from the TMG server to itself. So array member 1 was warning about a scan attack from a it's own public IP.
The issue was fixed with a reboot, but now I need to figure out the cause of this issue, and figure out a way to detect when it happens again.

Hi,
Thanks for your question.
As you mentioned, the RAM/memory usage is 100%. Did you see that in Task manager? Can you also see any app/process is using multiple memory?
In addition, I understand that TMG detected an all port scan attack from its external interface. Which traffic is routed via that external IP address? Maybe it is due to an IP spoofing.
Best regards,
Susie

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