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Port 5248 (caacws)

IANA assigns port 5248 to caacws: CA Access Control Web Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
caacws TCP CA Access Control Web Service Gabriel Kalmar -
caacws UDP CA Access Control Web Service Gabriel Kalmar -

Registry dates for this port: registered 2008-03-06.

Check what is listening on port 5248

Linux: is anything listening on TCP 5248?
sudo ss -tlnp 'sport = :5248'
Linux: UDP 5248
sudo ss -ulnp 'sport = :5248'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5248
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5248 '
Windows (Command Prompt)
netstat -ano | findstr :5248
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5248 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5248
From Windows
Test-NetConnection HOST -Port 5248
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5248

Block port 5248 in the firewall

ufw
sudo ufw deny 5248/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5248 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5248 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5248' -Direction Inbound -Protocol TCP -LocalPort 5248 -Action Block
ufw
sudo ufw deny 5248/udp
iptables
sudo iptables -A INPUT -p udp --dport 5248 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5248 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5248' -Direction Inbound -Protocol UDP -LocalPort 5248 -Action Block

Related ports

5246capwap-control5247capwap-data5249caaclang25250soagateway

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