Config sync problem

I could see the following potential causes:

 

 

Is your self-ip listening on port 443? I can't remember if F5 overrides the port lockdown setting to allow config-sync or not.

 

Do you have any firewalls between the units that might be blocking 443?

 

Are your VLAN names the same across units? If you have self-ips for the same subnet on both units, they need to be applied to the same VLANs which need to be named the same.