Intermittent connection problem with Firewall Client

Hello all,

I have an ISA Server setup Firewall mode with array configuration.
I have configured the client to use the automatic discovery option.

I have clients install with Firewall Client. I have an intermitten problem popup message from the Firewall Client saying that the server is down.

What can I check on the server or client to solve this problem ?

thank you & regards

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