tcp ip access prevention

dear all

i have lan and it is connected to a dsl router modem ie default gateway -192.168.1.254.

the lan clients include windows xp and one windows 2000 member server which is oracle database server and a developper 2000 financial application server. all clients are connected to the oracle database in the windows 2000 member server to access data base.

the problem now is the member server is not accessible from any client and vice versa.
but from the server it is able to brows internet that means its communicating with te DSL router.

it was working for last one year without any problem.

please help

nihad

mnihad@zahrawi.com