thanx people for instant reply.

well, ping is not working neither nslookup,tracert,telnet or any such command.

first let me tell u config of my system,

i work on a public computer which is w2k workstation attached to w2k server,on user accounts. i`m not sure there may be firewall at the back. as i don`t have any admin priviledges i cannot change any of the settings except which r allowed to users.

i tried to ping on www.yahoo.com(say) but it showed "unknown host message".