Port 4065 (avanti-cdp, avanti_cdp)

IANA assigns port 4065 to avanti-cdp, avanti_cdp: Avanti Common Data IANA assigned this well-formed service name as a replacement for "avanti_cdp"..

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

avanti-cdp TCP Avanti Common Data IANA assigned this well-formed service name as a replacement for "avanti_cdp". Steve Meyer Sr -

avanti_cdp TCP Avanti Common Data
This entry is an alias to "avanti-cdp". This entry is now historic, not usable for use with many common service discovery mechanisms. Steve Meyer Sr -

avanti-cdp UDP Avanti Common Data IANA assigned this well-formed service name as a replacement for "avanti_cdp". Steve Meyer Sr -

avanti_cdp UDP Avanti Common Data
This entry is an alias to "avanti-cdp". This entry is now historic, not usable for use with many common service discovery mechanisms. Steve Meyer Sr -

Registry dates for this port: registered 2007-02.

Check what is listening on port 4065

Linux: is anything listening on TCP 4065?

sudo ss -tlnp 'sport = :4065'

Linux: UDP 4065

sudo ss -ulnp 'sport = :4065'

Linux / macOS: which process owns the port

sudo lsof -nP -i :4065

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':4065 '

Windows (Command Prompt)

netstat -ano | findstr :4065

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4065 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 4065

From Windows

Test-NetConnection HOST -Port 4065

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

nc -vzu -w 5 HOST 4065

Block port 4065 in the firewall

ufw

sudo ufw deny 4065/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 4065 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 4065 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 4065' -Direction Inbound -Protocol TCP -LocalPort 4065 -Action Block

ufw

sudo ufw deny 4065/udp