Do allow me to clarify questions below with you.
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Who is the DNS server for the LAN clients?
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Do you confirm fe-1d29-2b.coredial.com is the only domain when customer is accessing the website?
For example, when you browse www.youtube.com. There is other domains (Ytimg.com, Ytimg.l.google.com, Youtube.l.google.com, Googlevideo.com and i.google.com) are running back-end without your knowledge. Due to this, an Enforced rule with domain youtube.com only will not work. You may need to check with the vendor on all the related domains.