HTTPfy

Port 800 (mdbs-daemon)

IANA assigns port 800 to mdbs-daemon: IANA assigned this well-formed service name as a replacement for "mdbs_daemon"..

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
mdbs-daemon TCP IANA assigned this well-formed service name as a replacement for "mdbs_daemon". - -
mdbs-daemon UDP IANA assigned this well-formed service name as a replacement for "mdbs_daemon". - -

Check what is listening on port 800

Linux: is anything listening on TCP 800?
sudo ss -tlnp 'sport = :800'
Linux: UDP 800
sudo ss -ulnp 'sport = :800'
Linux / macOS: which process owns the port
sudo lsof -nP -i :800
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':800 '
Windows (Command Prompt)
netstat -ano | findstr :800
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 800 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 800
From Windows
Test-NetConnection HOST -Port 800
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 800

Block port 800 in the firewall

ufw
sudo ufw deny 800/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 800 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 800 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 800' -Direction Inbound -Protocol TCP -LocalPort 800 -Action Block
ufw
sudo ufw deny 800/udp
iptables
sudo iptables -A INPUT -p udp --dport 800 -j DROP
nftables
sudo nft add rule inet filter input udp dport 800 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 800' -Direction Inbound -Protocol UDP -LocalPort 800 -Action Block

Related ports

775acmaint-transd777multiling-http802mbap-s810fcp-udp

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