Syslogtag pf. checksum

[rovshango]

What does this log means?

I think some serious issue :(

MY.WAN.IP.ADDRESS [More Information] .23392 > SOME.PUBLIC.IP.ADDRESS [More Information] {la-in-f102.1e100.net [More Information] } .443: Flags [.], cksum 0xc5ce (correct), ack 2007654048, win 245, options [nop,nop,TS val 37515631 ecr 1326411777,nop,nop,sack 1 {2007654010:2007654048}], length 0

Thanks.