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Port 2099 (h2250-annex-g)

IANA assigns port 2099 to h2250-annex-g: H.225.0 Annex G Signalling.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
h2250-annex-g TCP H.225.0 Annex G Signalling ITU-T -
h2250-annex-g UDP H.225.0 Annex G Signalling ITU-T -

Registry dates for this port: last modified 2013-01-31.

Check what is listening on port 2099

Linux: is anything listening on TCP 2099?
sudo ss -tlnp 'sport = :2099'
Linux: UDP 2099
sudo ss -ulnp 'sport = :2099'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2099
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2099 '
Windows (Command Prompt)
netstat -ano | findstr :2099
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2099 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2099
From Windows
Test-NetConnection HOST -Port 2099
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2099

Block port 2099 in the firewall

ufw
sudo ufw deny 2099/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2099 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2099 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2099' -Direction Inbound -Protocol TCP -LocalPort 2099 -Action Block
ufw
sudo ufw deny 2099/udp
iptables
sudo iptables -A INPUT -p udp --dport 2099 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2099 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2099' -Direction Inbound -Protocol UDP -LocalPort 2099 -Action Block

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