msg="no session matched"

[fayker]

hi 

i need some assistance, one of my voice systems are trying to talk out the wan to a collector, after running a debug i see the following 

# 2018-11-01 15:58:35 id=20085 trace_id=1 func=print_pkt_detail line=4903 msg="vd-root received a packet(proto=6, 10.250.39.4:4320->10.202.19.5:39013) from Voice_1. flag [.], seq 3567147422, ack 2872486997, win 8192" 2018-11-01 15:58:35 id=20085 trace_id=1 func=vf_ip_route_input_common line=2583 msg="find a route: flag=04000000 gw-192.168.102.201 via WAN_Ext" 2018-11-01 15:58:35 id=20085 trace_id=1 func=fw_forward_dirty_handler line=324 msg="no session matched" 2018-11-01 15:58:45 id=20085 trace_id=2 func=print_pkt_detail line=4903 msg="vd-root received a packet(proto=6, 10.250.39.4:4320->10.202.19.5:39013) from Voice_1. flag [.], seq 3567147422, ack 2872486997, win 8192" 2018-11-01 15:58:45 id=20085 trace_id=2 func=vf_ip_route_input_common line=2583 msg="find a route: flag=04000000 gw-192.168.102.201 via WAN_Ext" 2018-11-01 15:58:45 id=20085 trace_id=2 func=fw_forward_dirty_handler line=324 msg="no session matched"

if anyone can assist is will be very helpfull, i even tried pushing up the seesion timeout but without any luck. 

[emnoc]

This came up  a whiel since they are "Ack" and no session  in the table, fortigate is  dropping the  session

Do you see a pattern? { same hosts, same ports,same seq#,etc..)

The log sample seems to  indicate these are a loop of the same traffic flow

https://forum.fortinet.com/tm.aspx?m=112084