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Port 3248 (procos-lm)

IANA assigns port 3248 to procos-lm: PROCOS LM.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
procos-lm TCP PROCOS LM Torsten Rendelmann -
procos-lm UDP PROCOS LM Torsten Rendelmann -

Check what is listening on port 3248

Linux: is anything listening on TCP 3248?
sudo ss -tlnp 'sport = :3248'
Linux: UDP 3248
sudo ss -ulnp 'sport = :3248'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3248
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3248 '
Windows (Command Prompt)
netstat -ano | findstr :3248
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3248 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3248
From Windows
Test-NetConnection HOST -Port 3248
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3248

Block port 3248 in the firewall

ufw
sudo ufw deny 3248/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3248 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3248 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3248' -Direction Inbound -Protocol TCP -LocalPort 3248 -Action Block
ufw
sudo ufw deny 3248/udp
iptables
sudo iptables -A INPUT -p udp --dport 3248 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3248 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3248' -Direction Inbound -Protocol UDP -LocalPort 3248 -Action Block

Related ports

3246dvt-system3247dvt-data3249ssp3250hicp

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