# V21.1¶

Node Protocol Database Release Date Release Notes GitHub Links
21.1 18 18 2020-07-14 V21.1 Release - Milestone - Changelog
Known Issue V19+: 'Too many open files'
• Issue: The following error, or a similar one, can be seen when attempting to run a full node on some versions of macOS, Linux and possibly other operating systems. This is most common when using the built-in Qt wallet or other GUI-based wallets: "Exception while running wallet: open: Too many open files" or other errors containing "Too many open files". This is due to some systems having a very low default file descriptor limit and V19.0+ uses more of them after the move to TCP.

• Solution: Increasing the file limits is needed to resolve this. See this known issue for more details on resolution.

Known Issue Windows V21: Crash when using config node.logging.stable_log_filename

Setting node.logging.stable_log_filename configuration option to true results in a node crash on Windows in V21.0 and V21.1, after a node restart. This must be set to false.