HTTPfy

Port 3790 (quickbooksrds)

IANA assigns port 3790 to quickbooksrds: QuickBooks RDS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
quickbooksrds TCP QuickBooks RDS Almira -
quickbooksrds UDP QuickBooks RDS Almira -

Registry dates for this port: registered 2003-07.

Check what is listening on port 3790

Linux: is anything listening on TCP 3790?
sudo ss -tlnp 'sport = :3790'
Linux: UDP 3790
sudo ss -ulnp 'sport = :3790'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3790
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3790 '
Windows (Command Prompt)
netstat -ano | findstr :3790
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3790 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3790
From Windows
Test-NetConnection HOST -Port 3790
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3790

Block port 3790 in the firewall

ufw
sudo ufw deny 3790/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3790 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3790 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3790' -Direction Inbound -Protocol TCP -LocalPort 3790 -Action Block
ufw
sudo ufw deny 3790/udp
iptables
sudo iptables -A INPUT -p udp --dport 3790 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3790 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3790' -Direction Inbound -Protocol UDP -LocalPort 3790 -Action Block

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