802.1 issues in LINUX

802.1 issues in LINUX-general Linux technology-Linux technology and application information. For details, refer to the following section. The younger brother is a newbie. students in the school. The campus network does not have a LINUX client, so they have to find one on the Internet.
After installation, the following prompt is displayed during running:
[Root @ BYSTANDER mdc-ssd] # mdc-ssd
Fcntl (F_SETFL): Invalid argument
Mdc-ssd: Couldn't create raw mode socket.
: Illegal seek
Mdc-ssd: Couldn't create raw mode socket: Illegal seek.
[Root @ BYSTANDER mdc-ssd] # mdc-ssd
Mdc-ssd options in effect:
Nodetach # (from/etc/mdc-ssd/options)
Logfd 1 # (from/etc/mdc-ssd/options)
Dump # (from/etc/mdc-ssd/options)
TLSdebug # (from/etc/mdc-ssd/options)
TLSstate # (from/etc/mdc-ssd/options)
TLSbugs # (from/etc/mdc-ssd/options)
Cli. c: 149: bind: Address already in use
Mdc-ssd: Unable to open socket to communicate with p8021xc client. If mdc-ssd is already running, use clientPort option.
Mdc-ssd: Unable to open socket to communicate with p8021xc client. If mdc-ssd is already running, use clientPort option.
Mdc-ssd: 802.1X: txLogoff (port = 1) (transmit an EAP logoff packet)
It seems that my port settings are incorrect?
How can I set it?
I have been tossing for a long time and have not figured out -_-#