Port 6501 (boks-servc, boks_servc)

IANA assigns port 6501 to boks-servc, boks_servc: BoKS Servc IANA assigned this well-formed service name as a replacement for "boks_servc"..

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

boks-servc TCP BoKS Servc IANA assigned this well-formed service name as a replacement for "boks_servc". Magnus Nystrom -

boks_servc TCP BoKS Servc
This entry is an alias to "boks-servc". This entry is now historic, not usable for use with many common service discovery mechanisms. Magnus Nystrom -

boks-servc UDP BoKS Servc IANA assigned this well-formed service name as a replacement for "boks_servc". Magnus Nystrom -

boks_servc UDP BoKS Servc
This entry is an alias to "boks-servc". This entry is now historic, not usable for use with many common service discovery mechanisms. Magnus Nystrom -

Check what is listening on port 6501

Linux: is anything listening on TCP 6501?

sudo ss -tlnp 'sport = :6501'

Linux: UDP 6501

sudo ss -ulnp 'sport = :6501'

Linux / macOS: which process owns the port

sudo lsof -nP -i :6501

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':6501 '

Windows (Command Prompt)

netstat -ano | findstr :6501

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6501 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 6501

From Windows

Test-NetConnection HOST -Port 6501

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 6501

Block port 6501 in the firewall

ufw

sudo ufw deny 6501/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 6501 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 6501 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 6501' -Direction Inbound -Protocol TCP -LocalPort 6501 -Action Block

ufw

sudo ufw deny 6501/udp