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Port 386 (asa)

IANA assigns port 386 to asa: ASA Message Router Object Def..

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
asa TCP ASA Message Router Object Def. Steve Laitinen -
asa UDP ASA Message Router Object Def. Steve Laitinen -

Check what is listening on port 386

Linux: is anything listening on TCP 386?
sudo ss -tlnp 'sport = :386'
Linux: UDP 386
sudo ss -ulnp 'sport = :386'
Linux / macOS: which process owns the port
sudo lsof -nP -i :386
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':386 '
Windows (Command Prompt)
netstat -ano | findstr :386
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 386 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 386
From Windows
Test-NetConnection HOST -Port 386
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 386

Block port 386 in the firewall

ufw
sudo ufw deny 386/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 386 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 386 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 386' -Direction Inbound -Protocol TCP -LocalPort 386 -Action Block
ufw
sudo ufw deny 386/udp
iptables
sudo iptables -A INPUT -p udp --dport 386 -j DROP
nftables
sudo nft add rule inet filter input udp dport 386 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 386' -Direction Inbound -Protocol UDP -LocalPort 386 -Action Block

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384arns385ibm-app387aurp388unidata-ldm

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