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Port 3958 (mqe-agent)

IANA assigns port 3958 to mqe-agent: MQEnterprise Agent.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mqe-agent TCP MQEnterprise Agent Bob Lauria -
mqe-agent UDP MQEnterprise Agent Bob Lauria -

Registry dates for this port: registered 2005-08.

Check what is listening on port 3958

Linux: is anything listening on TCP 3958?
sudo ss -tlnp 'sport = :3958'
Linux: UDP 3958
sudo ss -ulnp 'sport = :3958'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3958
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3958 '
Windows (Command Prompt)
netstat -ano | findstr :3958
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3958 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3958
From Windows
Test-NetConnection HOST -Port 3958
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3958

Block port 3958 in the firewall

ufw
sudo ufw deny 3958/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3958 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3958 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3958' -Direction Inbound -Protocol TCP -LocalPort 3958 -Action Block
ufw
sudo ufw deny 3958/udp
iptables
sudo iptables -A INPUT -p udp --dport 3958 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3958 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3958' -Direction Inbound -Protocol UDP -LocalPort 3958 -Action Block

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