Happy holydays everybody!
I have a small weird problem. Maybe someone has an idea where to look for a solution.
We have a main office and several branches, all use UTM 9. The office and the branches are connected via Site-to-site VPN Tunnels.
The branches have 2 main networks: Administration (interface on eth0) VLAN 1 on switches and Learning (interface on eth2), VLAN2 on switches. Every network has a separate DHCP. Some hosts from these networks are connected via Firewall rules. Everything works fine.
Firmware 9.408-4
The problem:
I connect from the main office to a host in one branch via RDP. If I turn off the interface Learning on the UTM in this branch I lose an RDP connection to a host in the Administration network for 4 – 5 seconds. I send a ping –t to this host: I lose 3 pings. When I turn on the interface Learning I lose the connection again but for like a second. It feels like RDP “blinks”.
In the second branch I don’t have this problem. If I turn off the Learning interface the RDP connection works without interruptions and I don’t lose any pings. I have compared the settings regarding Interfaces on both UTMs – I don’t see any substantial differences.
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