Make sure your ETC clients are in the newest release. The new clients are compatible with the latest Thanos upgrade (ECIP 1099) performed on block 11_700_000 in December 2020.
The links on this page are contributions by ETC participants and are not guaranteed to be safe; use them at your own risk! Please do your own research before using any of resources on this site.
Social Channels
The following is a non-exhaustive list of active Ethereum Classic discussion channels and groups.