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SSL VPN: Non-OpenVPN client protocol detected

Hello All,
 
I have setup an SSL VPN that works from my phones cellular network using UserA.
 
When trying to connect using the same phone/user from the internal network of my ISP router/gateway (192.168.1.1), I get the output below in the SSL Live VPN log. I am however able to log in to the VPN user portal from the same network (192.168.1.0) on the same phone using the same user. 
 
 
ISP Router/Gateway IP: 192.168.1.1
Phones IP: 192.168.1.100
Sophos UTM 9 Behind ISP Router - WAN interface IP: 192.168.1.200
No internal networks on the Sophos UTM conflict/overlap the network ID above
 
SSL VPN Live Log:
2019:04:05-21:16:35 fw1 openvpn[25885]: TCP connection established with [AF_INET]192.168.1.100:57734 (via [AF_INET]192.168.1.200:443)
2019:04:05-21:16:35 fw1 openvpn[25885]: 192.168.1.100:57734 Non-OpenVPN client protocol detected
2019:04:05-21:16:35 fw1 openvpn[25885]: 192.168.1.100:57734 SIGTERM[soft,port-share-redirect] received, client-instance exiting
 
Dynamic DNS is being used, however the VPN client shows the connection by public IP anyway for whatever reason.
 
I understand this is a odd use case, which is probably why I'm having trouble finding a solution, and I'm sure the answer is something simple.
 
I'm a systems administrator that has little to no experience with firewalls and VPNs. This is my first time posting on any forum so I appreciate your time and patience in advance. Please let me know if I can provide any other useful information I might have left out.
 


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Parents Reply
  • Sorry for the delayed reply. I have made the requested change. I still cannot connect to establish a vpn connection from my home ISP network, but I can do everything else as before. I have not yet checked the logs on the firewall to see if it is showing anything different. However the client reports connection refused.

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