RED tunnel can't reconnect automatically

Can you tell us, which site causes this issue? XG or RED? 

Do you see the RED trying to connect to the XG and failing or is there simply "nothing" in the RED log on XG? 

Did you perform a dump on Port 3410 and Port 3400 while this issue occurs? 

Two sites use XG appliance both.

HeadOffice is XG210 (SFOS 16.05.8 MR-8),

BranchOffice is XG115 (SFOS 17.1.3 MR-3).

When the RED connection failed, the connect status still show "Uplink IP: XXX.XXX.XXX.XXX" on HeadOffice's XG.

I need to stop the RED, and start it again to make the connection work really.

Any suggestion?

found this in a KB 

"

If you see the tunnel constantly going up and down you may need to disable hardware acceleration.

Logon to the console of the XG and issue the following commands.

• console> system firewall-acceleration show

• console> system firewall-acceleration disable

"

KB: https://community.sophos.com/kb/en-us/126454

Thanks for reply.

But the RED status always show "Uplink" but not up and down.

It should be different issue.

Thanks for reply.

But the RED status always show "Uplink" but not up and down.

It should be different issue.

Would suggest to update this V16 Appliance. You are couple of bug fixes behind...