browser in the Remore office can't resolve the internal DNS address

Hi,

I have a remote office. All computers there are jointed to AD domain and successfully connected to DC /DNS Server in Main office. They getting GP, I can nslookup the DNS from those PCs and can nslookup those PCs.

A have an Intranet Web Server in main location (Parkslopeserver). I am able to ping and trace this Server from remote office. I am able to nslookup this server via IP address and DNS Name. (I see the resultparkslopeserver.parkslopecenter.local). 

But when I try to get this Web address via browsers:http://Parkslopeserver–my browsers getting error-No Name resolved or something like that.

When I insert a appropriate record to the host file-( parkslopeserver   10.15.0...) everything start working fine and I can access this Web Server via any browser.

Should I open some ports in Firewall? Can somebody please point me what should I do in order for browsers resolve the internal DNS address?

Thank you in advance