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Port 9085 (ibm-rsyscon)

IANA assigns port 9085 to ibm-rsyscon: IBM Remote System Console.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ibm-rsyscon TCP IBM Remote System Console William LePera -
ibm-rsyscon UDP IBM Remote System Console William LePera -

Registry dates for this port: registered 2008-06-18.

Check what is listening on port 9085

Linux: is anything listening on TCP 9085?
sudo ss -tlnp 'sport = :9085'
Linux: UDP 9085
sudo ss -ulnp 'sport = :9085'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9085
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9085 '
Windows (Command Prompt)
netstat -ano | findstr :9085
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9085 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9085
From Windows
Test-NetConnection HOST -Port 9085
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9085

Block port 9085 in the firewall

ufw
sudo ufw deny 9085/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9085 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9085 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9085' -Direction Inbound -Protocol TCP -LocalPort 9085 -Action Block
ufw
sudo ufw deny 9085/udp
iptables
sudo iptables -A INPUT -p udp --dport 9085 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9085 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9085' -Direction Inbound -Protocol UDP -LocalPort 9085 -Action Block

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