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Port 10990 (rmiaux)

IANA assigns port 10990 to rmiaux: Auxiliary RMI Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rmiaux TCP Auxiliary RMI Port Eugen Bacic 2 -
rmiaux UDP Auxiliary RMI Port Eugen Bacic 2 -

Check what is listening on port 10990

Linux: is anything listening on TCP 10990?
sudo ss -tlnp 'sport = :10990'
Linux: UDP 10990
sudo ss -ulnp 'sport = :10990'
Linux / macOS: which process owns the port
sudo lsof -nP -i :10990
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':10990 '
Windows (Command Prompt)
netstat -ano | findstr :10990
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 10990 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 10990
From Windows
Test-NetConnection HOST -Port 10990
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 10990

Block port 10990 in the firewall

ufw
sudo ufw deny 10990/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 10990 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 10990 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 10990' -Direction Inbound -Protocol TCP -LocalPort 10990 -Action Block
ufw
sudo ufw deny 10990/udp
iptables
sudo iptables -A INPUT -p udp --dport 10990 -j DROP
nftables
sudo nft add rule inet filter input udp dport 10990 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 10990' -Direction Inbound -Protocol UDP -LocalPort 10990 -Action Block

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