HTTPfy

Port 2699 (csoft-plusclnt)

IANA assigns port 2699 to csoft-plusclnt: Csoft Plus Client.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
csoft-plusclnt TCP Csoft Plus Client Nedelcho Stanev -
csoft-plusclnt UDP Csoft Plus Client Nedelcho Stanev -

Check what is listening on port 2699

Linux: is anything listening on TCP 2699?
sudo ss -tlnp 'sport = :2699'
Linux: UDP 2699
sudo ss -ulnp 'sport = :2699'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2699
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2699 '
Windows (Command Prompt)
netstat -ano | findstr :2699
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2699 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2699
From Windows
Test-NetConnection HOST -Port 2699
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2699

Block port 2699 in the firewall

ufw
sudo ufw deny 2699/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2699 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2699 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2699' -Direction Inbound -Protocol TCP -LocalPort 2699 -Action Block
ufw
sudo ufw deny 2699/udp
iptables
sudo iptables -A INPUT -p udp --dport 2699 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2699 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2699' -Direction Inbound -Protocol UDP -LocalPort 2699 -Action Block

Related ports

2697oce-snmp-trap2698mck-ivpip2700tqdata2701sms-rcinfo

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.