RED constantly disconnecting / unstable tunnel

Hi,

 

I recenetly installed a RED at a remote site and cousn't get it to provide a stable connection back to our UTM. 

 

Looking at the UTM logs it constantly cycles with the following

 

2019:03:15-07:18:34 bch-sophosutm-aimes red_server[18177]: SELF: New connection from 195.188.243.4 with ID A3501B004319705 (cipher AES256-GCM-SHA384), rev1
2019:03:15-07:18:34 bch-sophosutm-aimes red_server[18177]: A3501B004319705: already connected, releasing old connection.
2019:03:15-07:18:34 bch-sophosutm-aimes red_server[17817]: id="4202" severity="info" sys="System" sub="RED" name="RED Tunnel Down" red_id="A3501B004319705" forced="1"
2019:03:15-07:18:34 bch-sophosutm-aimes red_server[17817]: A3501B004319705 is disconnected.
2019:03:15-07:18:36 bch-sophosutm-aimes red_server[18177]: A3501B004319705: connected OK, pushing config
2019:03:15-07:18:40 bch-sophosutm-aimes red_server[18177]: A3501B004319705: command 'UMTS_STATUS value=OK'
2019:03:15-07:18:40 bch-sophosutm-aimes red_server[18177]: A3501B004319705: command 'PING 0 uplink=WAN'
2019:03:15-07:18:40 bch-sophosutm-aimes red_server[18177]: id="4201" severity="info" sys="System" sub="RED" name="RED Tunnel Up" red_id="A3501B004319705" forced="0"
2019:03:15-07:18:40 bch-sophosutm-aimes red_server[18177]: A3501B004319705: PING remote_tx=0 local_rx=0 diff=0
2019:03:15-07:18:40 bch-sophosutm-aimes red_server[18177]: A3501B004319705: PONG local_tx=0
2019:03:15-07:18:55 bch-sophosutm-aimes red_server[18177]: A3501B004319705: command 'PING 0 uplink=WAN'
2019:03:15-07:18:55 bch-sophosutm-aimes red_server[18177]: A3501B004319705: PING remote_tx=0 local_rx=0 diff=0
2019:03:15-07:18:55 bch-sophosutm-aimes red_server[18177]: A3501B004319705: PONG local_tx=0
2019:03:15-07:19:10 bch-sophosutm-aimes red_server[18177]: A3501B004319705: command 'PING 0 uplink=WAN'
2019:03:15-07:19:10 bch-sophosutm-aimes red_server[18177]: A3501B004319705: PING remote_tx=0 local_rx=0 diff=0
2019:03:15-07:19:10 bch-sophosutm-aimes red_server[18177]: A3501B004319705: PONG local_tx=0
2019:03:15-07:19:11 bch-sophosutm-aimes red_server[18177]: A3501B004319705: command 'SYSSTATE unstable peer using stabilization timeout 30'
2019:03:15-07:19:11 bch-sophosutm-aimes red_server[18177]: A3501B004319705: command 'CON_CLOSE reason=no_peer'
2019:03:15-07:19:41 bch-sophosutm-aimes red_server[18177]: A3501B004319705: No ping for 30 seconds, exiting.
2019:03:15-07:19:41 bch-sophosutm-aimes red_server[18177]: id="4202" severity="info" sys="System" sub="RED" name="RED Tunnel Down" red_id="A3501B004319705" forced="0"
2019:03:15-07:19:41 bch-sophosutm-aimes red_server[18177]: A3501B004319705 is disconnected.
2019:03:15-07:20:04 bch-sophosutm-aimes red_server[18934]: SELF: New connection from 195.188.243.4 with ID A3501B004319705 (cipher AES256-GCM-SHA384), rev1
2019:03:15-07:20:04 bch-sophosutm-aimes red_server[18934]: A3501B004319705: connected OK, pushing config
2019:03:15-07:20:11 bch-sophosutm-aimes red_server[18934]: A3501B004319705: command 'UMTS_STATUS value=OK'
2019:03:15-07:20:11 bch-sophosutm-aimes red_server[18934]: A3501B004319705: command 'PING 0 uplink=WAN'
2019:03:15-07:20:11 bch-sophosutm-aimes red_server[18934]: id="4201" severity="info" sys="System" sub="RED" name="RED Tunnel Up" red_id="A3501B004319705" forced="0"
2019:03:15-07:20:11 bch-sophosutm-aimes red_server[18934]: A3501B004319705: PING remote_tx=0 local_rx=0 diff=0
2019:03:15-07:20:11 bch-sophosutm-aimes red_server[18934]: A3501B004319705: PONG local_tx=0
2019:03:15-07:20:27 bch-sophosutm-aimes red_server[18934]: A3501B004319705: command 'PING 0 uplink=WAN'
2019:03:15-07:20:27 bch-sophosutm-aimes red_server[18934]: A3501B004319705: PING remote_tx=0 local_rx=0 diff=0
2019:03:15-07:20:27 bch-sophosutm-aimes red_server[18934]: A3501B004319705: PONG local_tx=0
2019:03:15-07:20:41 bch-sophosutm-aimes red_server[18934]: A3501B004319705: command 'PING 0 uplink=WAN'
2019:03:15-07:20:41 bch-sophosutm-aimes red_server[18934]: A3501B004319705: PING remote_tx=0 local_rx=0 diff=0
2019:03:15-07:20:41 bch-sophosutm-aimes red_server[18934]: A3501B004319705: PONG local_tx=0
2019:03:15-07:20:42 bch-sophosutm-aimes red_server[18934]: A3501B004319705: command 'SYSSTATE unstable peer using stabilization timeout 30'
2019:03:15-07:20:42 bch-sophosutm-aimes red_server[18934]: A3501B004319705: command 'CON_CLOSE reason=no_peer'
2019:03:15-07:20:47 bch-sophosutm-aimes red_server[19233]: SELF: New connection from 195.188.243.4 with ID A3501B004319705 (cipher AES256-GCM-SHA384), rev1
2019:03:15-07:20:47 bch-sophosutm-aimes red_server[19233]: A3501B004319705: already connected, releasing old connection.
2019:03:15-07:20:47 bch-sophosutm-aimes red_server[18934]: id="4202" severity="info" sys="System" sub="RED" name="RED Tunnel Down" red_id="A3501B004319705" forced="1"
 
I can see the TCP 3400 traffic from the external IP hitting our gateway, and nothing is being blocked, why is the RED unable to fully establish it's connection?