TELNET
You can see only remote IP address, it’s impossible to show logged in username.
ASA1# who
0: 192.168.1.200
ASA1#
ASA1# kill 0
ASA1#
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SSH
To see SSH users:
ASA1# show ssh sessions
SID Client IP Version Mode Encryption Hmac State Username
0 192.168.1.200 2.0 IN aes128-cbc sha1 SessionStarted newusername
OUT aes128-cbc sha1 SessionStarted newusername
ASA1#
ASA1# ssh disconnect 0
ASA1#
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ADSM (HTTPS)
ASA1# show asdm sessions
0 192.168.1.200
ASA1#
ASA1# asdm disconnect 0
ASA1#
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VPN
ASA1# show vpn-sessiondb
• Disconnect active users:
ASA1# vpn-sessiondb logoff webvpn noconfirm
ASA1# vpn-sessiondb logoff name NEWUSERNAME
ASA1# vpn-sessiondb logoff ?