Can not telnet to my Linux Box

Hello,

I have an NT network with 2 domains (A and B).

Domain A is a network of type: 192.168.5.x

Domain B is a network of type: 192.168.10.x

My linux Box is located in Domain A with an IP of type: 192.168.5.x

If I go to domain B and logon to a Win98 station with IP 192.168.10.x then I can not PING / Telnet my linux box at Domain A.

I do not know many things about linux configuration and probably something is missing.

Do you know what might cause this problem…?

Is it NTdomains?
IS it Linux Network configuration?
What troubleshooting steps do you suggest?

PS: The 2 NT domains are connected with Trust relationships (Domain A hosts the user accounts and authenticates domain B PCs)

Thanks in advance.