1433 -- ms-sql-s 1434 -- ms-sql-m ** I don't know why SQL ports are being attacked.
That's probably the Slammer worm, or someone exploiting the same vulerability. An old MSSQL risk only.
Anyway, it's always a good idea to run a firewall :)
//Andro
-- Andrey Andreev University of Helsinki Dept. of Computer Science