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Port 345 (pawserv)

IANA assigns port 345 to pawserv: Perf Analysis Workbench.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pawserv TCP Perf Analysis Workbench - -
pawserv UDP Perf Analysis Workbench - -

Check what is listening on port 345

Linux: is anything listening on TCP 345?
sudo ss -tlnp 'sport = :345'
Linux: UDP 345
sudo ss -ulnp 'sport = :345'
Linux / macOS: which process owns the port
sudo lsof -nP -i :345
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':345 '
Windows (Command Prompt)
netstat -ano | findstr :345
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 345 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 345
From Windows
Test-NetConnection HOST -Port 345
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 345

Block port 345 in the firewall

ufw
sudo ufw deny 345/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 345 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 345 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 345' -Direction Inbound -Protocol TCP -LocalPort 345 -Action Block
ufw
sudo ufw deny 345/udp
iptables
sudo iptables -A INPUT -p udp --dport 345 -j DROP
nftables
sudo nft add rule inet filter input udp dport 345 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 345' -Direction Inbound -Protocol UDP -LocalPort 345 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.