Changed to fixed IP on Linus box and broke Windows Networking????? Help!

[Stephen]

I have a Linux (Ubuntu) machine which is largely a server (apache, 
samba) and all was well when I had it set to dhcp.

I want to access from outside, so I changed to fixed IP and now I cannot 
see it from XP machines, and the Linux box cannot see the XP machines?

Pings work fine.

Any and all ideas welcome!

Thanks
Stephen

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