IPSEC VPN Multiple Lan Subnet from Sophos XGS to CISCO: only one subnet works at a time

Hi Gianluca,

Thank you for reaching out to Sophos Community.

I would recommend checking the logs/configuration(route, traffic, firewall rule) and comparing both subnets on both Cisco and Sophos firewalls.

You may check the following for reference. 

•  Sophos Firewall: How to Identify the communication issue with up and running IPSec tunnel 
• Sophos Firewall: Troubleshooting site to site IPsec VPN issues
• Packet Capture

Hi Gianluca,

Thank you for reaching out to Sophos Community.

I would recommend checking the logs/configuration(route, traffic, firewall rule) and comparing both subnets on both Cisco and Sophos firewalls.

You may check the following for reference. 

•  Sophos Firewall: How to Identify the communication issue with up and running IPSec tunnel 
• Sophos Firewall: Troubleshooting site to site IPsec VPN issues
• Packet Capture

Thanks Erick for the answer, I'll try with your suggestions and I'll come back with a feedback.

Excuse the delay, we solved using the first link you provided. Thanks Erick.