I did as you said, that is, I entered 5-10 nodes from this site
https://eca.ccore.online/connections, for synchronization, but there comes out this inscription: Method not found (code -32601) What can it be?
typing error?
addnode xxx.xxx.xxx.xxx add
doesn't give back "method not found" (were xxx.xxx.xxx.xxx stands for ip.addresses..)