Sub domain issues

I'll mention right away i don't know much about this network and learning as i go. New client with file transfer issues on internal network. Issue started happening when they added a second sub domain to the network. One is production and one is development. Dev is able to access production domain but production can't access development. Any suggestions on where i need to look to start troubleshooting this issue? Any advice is appreciated.

Server 2008
O GChief Technology Officer, Co-FounderAsked:
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systechadminConsultantCommented:
are they on same network? how about the trust relationship between these two domains
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Jason CrawfordTransport NinjaCommented:
AGDLP - https://technet.microsoft.com/en-us/library/cc755692(v=ws.10).aspx

What kind of groups are you using to control access?
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MichelangeloConsultantCommented:
Seeing your previous question on time sync, i would advise to configure time sync correctly before doing troubleshooting on authentication as kerberos will fail if your ad experiences time drift.
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O GChief Technology Officer, Co-FounderAuthor Commented:
Thank you Guarav, Jaon and Michelangelo. I think this is too early for me to answer your questions. Looks like The sub domain is on a different subnet routing through the firewall that doesn't support over 100 Mbps on that port. This might be an issue with the firewall. I will do further investigation and reopen this question when time is right. Again, thank you for your suggestions.
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MichelangeloConsultantCommented:
Just one more comment:
firewalls often are configured with a all-out/no-in policy, so it would be advisable to double check network access between the two hosts.
Active directory has very specific requirements about open ports, see a useful summary  here ,
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O GChief Technology Officer, Co-FounderAuthor Commented:
Thank you Michelangelo. That's very helpful.
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O GChief Technology Officer, Co-FounderAuthor Commented:
Thank you.
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