TCP connection attempts to port 27374

Hi, I'm curious about numerous (actually 25 in all) TCP connection attempts recently from unprivileged ports to port 27374. Looking at my firewall logs, I see that numerous source IP addresses have been used (generally 3 or 4 attempts per source address) over the last couple of weeks or so. I have a dial-up connection. Searching a recent copy of IANA's port numbers file I see that ports in the range 27008-27998 are unassigned. I'm just curious, my firewall's "deny"-ing the connection attempts. Anyone aware of any reason why port 27374 is being probed? Cheers - Les Catterall