Diag sys session list

Hello,

I am focusing in the session table and I have detected that isn't appear the destination port.

ession info: proto=6 proto_state=01 duration=44026 expire=3591 timeout=3600 flags=00000000 sockflag=00000000 sockport=0 av_idx=0 use=4 origin-shaper= reply-shaper= per_ip_shaper= ... Anybody knows what is the meaning?

Thanks in advance!