Server Administration :: Error / Network Adapter Could Not Establish The Connection

I have installed oracle 10g XE on my machine. And my machine's ip address is 10.10.50.50.

username:system
password:xxx
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.10.50.50)(PORT =1521))

[code]....

I was able to connect to the above server from my machine.But when i was trying to connect the above server from my neighbours system i am getting an error Network adapter could not establish the connection.

Note:when i ping the ip address 10.10.50.50 from my negihbours system in the command prompt

Reply from 10.10.50.50:bytes=32
Reply from 10.10.50.50:bytes=32
Reply from 10.10.50.50:bytes=32
Reply from 10.10.50.50:bytes=32