pings do not work in both directions

have a server 2008 R2 with HyperV, running two virtual machines, a TMG and DC,  the network card is "only inside".

 pings from TMG  respond to the IP of DC, but not viceversa, if I turn off the DC pings are interrupted.
limmontreefreeAsked:
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redbmasterConnect With a Mentor Commented:
This is usually caused by the firewall.
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limmontreefreeAuthor Commented:
thanks
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