Hello. There are messages like this in shorewall's logs. x.x.x.x is my site's IP address, both as the source and the destination. I've been told that they're caused by postgresql. Having these messages filtered out doesn't seem to affect postgresql in any way. Does anyone know why postgresql would want to talk to itself in this way? I'm using postgresql 7.4.7. My guess would be that this is some sort of a heartbeat. omega kernel: Shorewall:all2all:REJECT:IN= OUT=lo SRC=x.x.x.x DST=x.x.x.x LEN=1016 TOS=0x00 PREC=0x00 TTL=64 ID=21629 DF PROTO=UDP SPT=32769 DPT=32769 LEN=996