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Port 3055 (policyserver)

IANA assigns port 3055 to policyserver: Policy Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
policyserver TCP Policy Server Mark Garti -
policyserver UDP Policy Server Mark Garti -

Check what is listening on port 3055

Linux: is anything listening on TCP 3055?
sudo ss -tlnp 'sport = :3055'
Linux: UDP 3055
sudo ss -ulnp 'sport = :3055'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3055
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3055 '
Windows (Command Prompt)
netstat -ano | findstr :3055
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3055 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3055
From Windows
Test-NetConnection HOST -Port 3055
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3055

Block port 3055 in the firewall

ufw
sudo ufw deny 3055/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3055 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3055 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3055' -Direction Inbound -Protocol TCP -LocalPort 3055 -Action Block
ufw
sudo ufw deny 3055/udp
iptables
sudo iptables -A INPUT -p udp --dport 3055 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3055 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3055' -Direction Inbound -Protocol UDP -LocalPort 3055 -Action Block

Related ports

3053dsom-server3054amt-cnf-prot3056cdl-server3057goahead-fldup

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