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Port 1955 (abr-secure)

IANA assigns port 1955 to abr-secure: ABR-Secure Data (diskbridge).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
abr-secure TCP ABR-Secure Data (diskbridge) Graham Wooden -
abr-secure UDP ABR-Secure Data (diskbridge) Graham Wooden -

Check what is listening on port 1955

Linux: is anything listening on TCP 1955?
sudo ss -tlnp 'sport = :1955'
Linux: UDP 1955
sudo ss -ulnp 'sport = :1955'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1955
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1955 '
Windows (Command Prompt)
netstat -ano | findstr :1955
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1955 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1955
From Windows
Test-NetConnection HOST -Port 1955
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1955

Block port 1955 in the firewall

ufw
sudo ufw deny 1955/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1955 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1955 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1955' -Direction Inbound -Protocol TCP -LocalPort 1955 -Action Block
ufw
sudo ufw deny 1955/udp
iptables
sudo iptables -A INPUT -p udp --dport 1955 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1955 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1955' -Direction Inbound -Protocol UDP -LocalPort 1955 -Action Block

Related ports

1953rapidbase1954abr-api1956vrtl-vmf-ds1957unix-status

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