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Port 34965 (profinet-cm-sec)

IANA assigns port 34965 to profinet-cm-sec: PROFINET secure connection management and key provisioning.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
profinet-cm-sec TCP PROFINET secure connection management and key provisioning PNO PROFIBUS Nutzerorganisation e.V. -
profinet-cm-sec UDP PROFINET secure connection management and key provisioning PNO PROFIBUS Nutzerorganisation e.V. -

Registry dates for this port: registered 2026-03-10.

Check what is listening on port 34965

Linux: is anything listening on TCP 34965?
sudo ss -tlnp 'sport = :34965'
Linux: UDP 34965
sudo ss -ulnp 'sport = :34965'
Linux / macOS: which process owns the port
sudo lsof -nP -i :34965
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':34965 '
Windows (Command Prompt)
netstat -ano | findstr :34965
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 34965 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 34965
From Windows
Test-NetConnection HOST -Port 34965
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 34965

Block port 34965 in the firewall

ufw
sudo ufw deny 34965/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 34965 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 34965 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 34965' -Direction Inbound -Protocol TCP -LocalPort 34965 -Action Block
ufw
sudo ufw deny 34965/udp
iptables
sudo iptables -A INPUT -p udp --dport 34965 -j DROP
nftables
sudo nft add rule inet filter input udp dport 34965 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 34965' -Direction Inbound -Protocol UDP -LocalPort 34965 -Action Block

Related ports

34963profinet-rtm34964profinet-cm34966profinet-rt-sec34980ethercat

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.