SQL Authentication issue between Domains

I have two seperate domains and one of them is in a DMZ.I also am using a Cisco ASA 5510 for my firewall and i have any traffice configured from the DMZ domain to the corp domain. When i try to establish a ODBC connection from the DMZ domain to SQL server in the corp domain. The connection attemp fails with server not found or access denied. If i use the ( \\192.168.10.9\c$)  which is the corp domain SQL server and logon using that domain credential then the ODBC connection works. What is going on.??
jackelly01Asked:
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arnoldConnect With a Mentor Commented:
The SQL connection should go to ip\instance. Your example seems to be a connection to a share, admin share at that.
SQL has two authentication modes, one using Microsoft integrated authentication the other has the SQL login authentication. To use domain 1's credentials to authenticate to SQL on domain 2, there has to be a trust relationship where the credentials would be proxied as well as the SQL logins include a reference to the remote domain.

There is much that is unknown in the setup.
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