It means your Redis server might try to send us too many data to crash us down (a denial-of-service attack). This protection works at the lowest level of our stack so every Redsmin components (Key editor, Terminal, Memory Analyzer, ...) might yield this error.
If you get the ESOCKETOFVEFLOW error and still want to display a key data, use Redsmin terminal to load less data using the COUNT parameter of SCAN / SSCAN / HSCAN / ZSCAN.