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Port 40842 (csccredir)

IANA assigns port 40842 to csccredir: CSCCREDIR.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
csccredir TCP CSCCREDIR Sudhir Menon -
csccredir UDP CSCCREDIR Sudhir Menon -

Check what is listening on port 40842

Linux: is anything listening on TCP 40842?
sudo ss -tlnp 'sport = :40842'
Linux: UDP 40842
sudo ss -ulnp 'sport = :40842'
Linux / macOS: which process owns the port
sudo lsof -nP -i :40842
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':40842 '
Windows (Command Prompt)
netstat -ano | findstr :40842
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 40842 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 40842
From Windows
Test-NetConnection HOST -Port 40842
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 40842

Block port 40842 in the firewall

ufw
sudo ufw deny 40842/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 40842 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 40842 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 40842' -Direction Inbound -Protocol TCP -LocalPort 40842 -Action Block
ufw
sudo ufw deny 40842/udp
iptables
sudo iptables -A INPUT -p udp --dport 40842 -j DROP
nftables
sudo nft add rule inet filter input udp dport 40842 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 40842' -Direction Inbound -Protocol UDP -LocalPort 40842 -Action Block

Related ports

40404sptx40841cscp40843csccfirewall40853ortec-disc

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