It’s possible technically to downgrade a Berkeley DB to an older format using their command line tools. I build wallets with v5.3.28 currently. v6 is the AGPL v3 which might cause legal issues with the BSD/MIT software.
There is no feature to block any connection in the wallet code.
The problem is to get one initial connection to the feathercoin network, so the addresses of the active nodes can be learned.
If all build in mechanisms to get this first connection established fail, you can manually add a node to get the synchronization started.
then issue the command `feathercoind addnode 184.108.40.206 add’
start the gui
from the main window select ‘help’ ->‘Debug Window’ -> ‘console’
enter ‘feathercoind addnode 220.127.116.11 add’ in the input field at the bottom of the window
This should open a connection to the node 18.104.22.168 which is a p2pool node where a feathercoind is running all time. After some time additional nodes will be learned and the synchronization will start.
Please be aware, that each node has a maximum number of parallel connections and when this is reached, no additional connections will be accepted. Therefore it may take some time to get the initial connection.
If this doesn’t help, please provide the wallet version and OS you are using and if possible the content of the file debug.log which is located in the feathercoin data directory
I will move this thread to the support forum so other developer will find it more easily. You are able to post to that category, too after your initial post in the new member area.