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Port 3528 (jboss-iiop)

IANA assigns port 3528 to jboss-iiop: JBoss IIOP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
jboss-iiop TCP JBoss IIOP - -
jboss-iiop UDP JBoss IIOP - -

Check what is listening on port 3528

Linux: is anything listening on TCP 3528?
sudo ss -tlnp 'sport = :3528'
Linux: UDP 3528
sudo ss -ulnp 'sport = :3528'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3528
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3528 '
Windows (Command Prompt)
netstat -ano | findstr :3528
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3528 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3528
From Windows
Test-NetConnection HOST -Port 3528
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3528

Block port 3528 in the firewall

ufw
sudo ufw deny 3528/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3528 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3528 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3528' -Direction Inbound -Protocol TCP -LocalPort 3528 -Action Block
ufw
sudo ufw deny 3528/udp
iptables
sudo iptables -A INPUT -p udp --dport 3528 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3528 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3528' -Direction Inbound -Protocol UDP -LocalPort 3528 -Action Block

Related ports

3526starquiz-port3527beserver-msg-q3529jboss-iiop-ssl3530gf

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