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[suse-security] Portscans and SuSEFirewall2

Hi !

Today, my personal firewall notified my that my PC has been portscanned over the weekend over some higher ports(> 1024). My domain router/gateway is a SuSE 8.0 box with SuSEfirewall2. It is configured so that TCP communications can only pass through several specific ports (like 22, 25, 110, etc). All ports > 1024 are supposed to be blocked. 
Now I wonder : if my firewall is working as it should, how can I be portscanned ? My logs show no traffic with the IP number that scanned me which is not surprising since I only log denied traffic.

Can anybody explain this to me ?