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I think there is more to check than TCP 135 for the Firewall config https://social.technet.microsoft.com/wiki/contents/articles/16164.rds-2012-which-ports-are-used-during-deployment.aspx#Remote_Desktop_Licensing_Server

thanks dennis...i think its a DNS issue but not sure yet. i'll know more after they migrate more machines over.

@Ron Oglesby always says that it's 95% probability that its DNS (any issue). 🙂