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We're about to replace our current IPSec Server appliance with a Sophos XG86, at the same time we plan on changing 50+ remote modems out for RUT955s

The issue is that our current IPSec server is hogging the ports for IPSec at our host location and MUST remain in place until the entire fleet upgrade is complete to support connectivity for our sites yet to be upgraded. Is it possible for the RUT955 to be configured to use a different port to connect to our Sophos? Say Port 501 instead of 500? Where would I specify this in the configuration?

Thank you in advance.

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You can change the port, all you have to do is add a custom option into /var/ipsec/ipsec.conf file.

To do that use vi command to edit and save the changes you've done in that file, or use WinSCP as your navigation and editing app.

The option I'm talking about could be found here in this IPSec reference page: https://wiki.strongswan.org/projects/strongswan/wiki/connsection

The option is: left|rightikeport = <port>

You will find more information in the page I provided.