Red Connection issue

Dears

Good Day.

I success to establish a new red connection between Sophos x135 ( Server ) and Sophos Xg ( Client ).

and routing between two networks is working very well.

but I have a problem if the red connection status is down. I have to restart Sophos x135 ( Server ) to start connecting again.

So I want to know how to restart red Sophos services without restarting the firewall. 

Also. if I disable Red Configuration and enable again not work.

can anyone support me?

Thanks in advance.