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Port 30999 (ovobs)

IANA assigns port 30999 to ovobs: OpenView Service Desk Client.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ovobs TCP OpenView Service Desk Client Service Desk Product -
ovobs UDP OpenView Service Desk Client Service Desk Product -

Registry dates for this port: registered 2006-05.

Check what is listening on port 30999

Linux: is anything listening on TCP 30999?
sudo ss -tlnp 'sport = :30999'
Linux: UDP 30999
sudo ss -ulnp 'sport = :30999'
Linux / macOS: which process owns the port
sudo lsof -nP -i :30999
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':30999 '
Windows (Command Prompt)
netstat -ano | findstr :30999
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 30999 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 30999
From Windows
Test-NetConnection HOST -Port 30999
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 30999

Block port 30999 in the firewall

ufw
sudo ufw deny 30999/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 30999 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 30999 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 30999' -Direction Inbound -Protocol TCP -LocalPort 30999 -Action Block
ufw
sudo ufw deny 30999/udp
iptables
sudo iptables -A INPUT -p udp --dport 30999 -j DROP
nftables
sudo nft add rule inet filter input udp dport 30999 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 30999' -Direction Inbound -Protocol UDP -LocalPort 30999 -Action Block

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