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Port 8122 (apollo-admin)

IANA assigns port 8122 to apollo-admin: Apollo Admin Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apollo-admin TCP Apollo Admin Port Anthony Carrabino -
apollo-admin UDP Apollo Admin Port Anthony Carrabino -

Registry dates for this port: registered 2003-08.

Check what is listening on port 8122

Linux: is anything listening on TCP 8122?
sudo ss -tlnp 'sport = :8122'
Linux: UDP 8122
sudo ss -ulnp 'sport = :8122'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8122
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8122 '
Windows (Command Prompt)
netstat -ano | findstr :8122
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8122 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8122
From Windows
Test-NetConnection HOST -Port 8122
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8122

Block port 8122 in the firewall

ufw
sudo ufw deny 8122/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8122 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8122 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8122' -Direction Inbound -Protocol TCP -LocalPort 8122 -Action Block
ufw
sudo ufw deny 8122/udp
iptables
sudo iptables -A INPUT -p udp --dport 8122 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8122 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8122' -Direction Inbound -Protocol UDP -LocalPort 8122 -Action Block

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8118Privoxy8121apollo-data8128paycash-online8129paycash-wbp

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