bitcoincore banned all peers and I can't to sync

Question

I started downloading the chain and got to 14% and it just stopped and still shows 7% per hour but not moves.

I checked and it banned all the peers and everytime I unban them they just get banned again, what is happening ?

Answer 1

Peers can get blocked for multiple reasons

• sending too many invalid blocks
• sending too many malformed messages
• using too much bandwidth (e.g. your maxuploadtarget setting)

and probably others.

There are logs which may be helpful and you can review available options

-banscore=<n>
Threshold for disconnecting misbehaving peers (default: 100)

-bantime=<n>
Number of seconds to keep misbehaving peers from reconnecting  
(default:86400)


-whitelist=<IP address or network>
Whitelist peers connecting from the given IP address (e.g. 
1.2.3.4) or CIDR notated network (e.g. 1.2.3.0/24). Can be 
specified multiple times. Whitelisted peers cannot be DoS
banned and their transactions are always relayed, even if 
they are already in the mempool, useful e.g. for a gateway