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Port 2037 (applus)

IANA assigns port 2037 to applus: APplus Application Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
applus TCP APplus Application Server
Formerly was P2plus Application Server Alfred Weindl -
applus UDP APplus Application Server
Formerly was P2plus Application Server Alfred Weindl -

Registry dates for this port: registered 2008-06-06, last modified 2021-07-20.

Check what is listening on port 2037

Linux: is anything listening on TCP 2037?
sudo ss -tlnp 'sport = :2037'
Linux: UDP 2037
sudo ss -ulnp 'sport = :2037'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2037
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2037 '
Windows (Command Prompt)
netstat -ano | findstr :2037
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2037 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2037
From Windows
Test-NetConnection HOST -Port 2037
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2037

Block port 2037 in the firewall

ufw
sudo ufw deny 2037/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2037 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2037 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2037' -Direction Inbound -Protocol TCP -LocalPort 2037 -Action Block
ufw
sudo ufw deny 2037/udp
iptables
sudo iptables -A INPUT -p udp --dport 2037 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2037 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2037' -Direction Inbound -Protocol UDP -LocalPort 2037 -Action Block

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