[pptp-server] PPTP Problem

[Jennifer]

I recently downloaded poptop and installed it on a linux server.
Everything works fine and I can connect with one windows client and can
ping inside the tunnel.  The problem comes in when I connect to the
server
making a second connection with another windows machine.  Once the
second
connection is made I can't ping anymore from either connection.  There
are
no errors sent to the pptpd log either.  Does anyone have any idea what
could be happening?

Thanks

Jen