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Port 2773 (rbakcup1)

IANA assigns port 2773 to rbakcup1: RBackup Remote Backup.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rbakcup1 TCP RBackup Remote Backup - -
rbakcup1 UDP RBackup Remote Backup - -

Check what is listening on port 2773

Linux: is anything listening on TCP 2773?
sudo ss -tlnp 'sport = :2773'
Linux: UDP 2773
sudo ss -ulnp 'sport = :2773'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2773
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2773 '
Windows (Command Prompt)
netstat -ano | findstr :2773
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2773 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2773
From Windows
Test-NetConnection HOST -Port 2773
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2773

Block port 2773 in the firewall

ufw
sudo ufw deny 2773/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2773 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2773 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2773' -Direction Inbound -Protocol TCP -LocalPort 2773 -Action Block
ufw
sudo ufw deny 2773/udp
iptables
sudo iptables -A INPUT -p udp --dport 2773 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2773 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2773' -Direction Inbound -Protocol UDP -LocalPort 2773 -Action Block

Related ports

2771vergencecm2772auris2774rbakcup22775smpp

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