0xc000021b

The 0xc000021b tag on WindowsForum.com covers discussions about the 0xC000021B error, a Windows stop code that typically indicates a critical system failure. Based on available content, this error has been reported in contexts involving network buffer lists (NBLs) with multiple net buffers for IPv6. Users encountering this blue screen error may find threads exploring its causes, such as driver or network stack issues, and potential troubleshooting steps. The tag serves as a resource for those seeking solutions to this specific Windows error, with community members sharing experiences and fixes related to system crashes and network-related problems.