Why Can I Not Ping My Other Pc Through A Switch?

[Tonar]

I have 2 PC's connected to a switch, which is then in turn connected to a DSL modem to the Ethernet.

I am trying to ping the other PC with timeouts. What Oh GURU's am I missing?

[B16Enk]

1. Both PCs need to be on same subnet, this should happen automatically if both are set to get IP from DHCP and your router/switch acts as a dhcp server.
   If you do not have a router (you mention 'switch' then they will auto assign an IP - this should be on same subnet/mask..need more detail (output of start > run > cmd + enter > ipconfig/all from both systems).
2. Firewall(s) may be blocking ICMP (ping).

[Tonar]

Firewall it was !!

One day I will remember to check that pesky thing first.

Thanks Roger