HTTPfy

Port 5502 (fcp-srvr-inst1)

IANA assigns port 5502 to fcp-srvr-inst1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fcp-srvr-inst1 TCP fcp-srvr-inst1 Ken Wittmer -
fcp-srvr-inst1 UDP fcp-srvr-inst1 Ken Wittmer -

Check what is listening on port 5502

Linux: is anything listening on TCP 5502?
sudo ss -tlnp 'sport = :5502'
Linux: UDP 5502
sudo ss -ulnp 'sport = :5502'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5502
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5502 '
Windows (Command Prompt)
netstat -ano | findstr :5502
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5502 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5502
From Windows
Test-NetConnection HOST -Port 5502
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5502

Block port 5502 in the firewall

ufw
sudo ufw deny 5502/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5502 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5502 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5502' -Direction Inbound -Protocol TCP -LocalPort 5502 -Action Block
ufw
sudo ufw deny 5502/udp
iptables
sudo iptables -A INPUT -p udp --dport 5502 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5502 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5502' -Direction Inbound -Protocol UDP -LocalPort 5502 -Action Block

Related ports

5500fcp-addr-srvr15501fcp-addr-srvr25503fcp-srvr-inst25504fcp-cics-gw1

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