We have joined with many Minecraft servers in blocking the /ver and /version in-game commands.

The /ver (or /version) command is blocked on many Minecraft servers to prevent players from exploiting outdated plugins or revealing server version details that could be used for targeted attacks. 

Many server administrators often block version commands because they allow malicious users to identify server vulnerabilities and pursue exploits against outdated software. Additionally, blocking /ver is part of a broader security practice where initial commands for plugins are restricted to stop unauthorized access to plugin-specific functions (e.g., blocking /admin prevents access to /admin performance or /admin reports).