security - Weird hits on port 2703

I'm getting these periodical console messages on my Mac:


7/22/11 8:01:03.925 AM Firewall: Stealth Mode connection attempt to UDP 10.0.0.1:2703 from 91.143.232.133:15881
7/22/11 8:01:05.885 AM Firewall: Stealth Mode connection attempt to UDP 10.0.0.1:2703 from 91.143.232.133:15881
7/22/11 8:01:09.926 AM Firewall: Stealth Mode connection attempt to UDP 10.0.0.1:2703 from 91.143.232.133:15881

Ran whois 91.143.232.133 and got:


inetnum:        91.143.232.128 - 91.143.232.143
netname:        CVIDIA
descr:          CVIDIA  ltd
country:        il
admin-c:        OH341-RIPE
tech-c:         OH341-RIPE
status:         ASSIGNED PA
mnt-by:         QOS-ISP-MNT
source:         RIPE # Filtered

Checked where the IP leads to, it leads here: https://91.143.232.133/Login/Login

I've read the port 2703 is used for SMS chat, but also might be used by a trojan.

Should I be worried?

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