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Hi there,

2 Locations

Location 1 (HQ):
Lancom 1721 VPN
Network: 192.168.yyy.yyy
VPN-tunnel to Location 2
Software xy connect via FTP over WAN to Location 2 to 192.168.1.x (yeah i know, VPN-tunnel and establish unsecure ftp over external ip -.-)

Location 2:
Lancom 1781 with Port forwarding for port 21 to an 192.168.xxx.x
Network 192.168.xxx.xxx

Now we kicked out the Lancom 1721 on our HQ. We use a Control now with IPSec VPN to Location 2

Now the Problem:

since we have the Kerio Control, Software XY can not establish a FTP Connection to 192.168.xxx.x (something with RENAME error). Same with WAN connection and VPN-tunnel.

If i change the port forwarding of the Lancom 1781 on Location 2 from port forwarding 21 to Port remapping 2222->21
i can establish the FTP connection without any problem.

i found this log-entry:
IPS: Port Scan, protocol: TCP, source: 192.168.yyy.yyy, destination: LOCATION2, ports: 53058, 53064, 53065, 2122, 53066, 53067, 53068, 53069, 53070, 53071, ...

I thought intrusion prevention blocks something, so i deactivated it, but still the same error.
I also deactivated Web Filter, but with the same result.
(anti-spoofing is also deactivated)

So where does Control block my FTP connection?! I have no traffic rule for FTP here that blocks anything. The VPN-network traffic is allowed for everything too.

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