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Port 3957 (mqe-broker)

IANA assigns port 3957 to mqe-broker: MQEnterprise Broker.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mqe-broker TCP MQEnterprise Broker - -
mqe-broker UDP MQEnterprise Broker - -

Check what is listening on port 3957

Linux: is anything listening on TCP 3957?
sudo ss -tlnp 'sport = :3957'
Linux: UDP 3957
sudo ss -ulnp 'sport = :3957'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3957
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3957 '
Windows (Command Prompt)
netstat -ano | findstr :3957
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3957 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3957
From Windows
Test-NetConnection HOST -Port 3957
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3957

Block port 3957 in the firewall

ufw
sudo ufw deny 3957/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3957 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3957 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3957' -Direction Inbound -Protocol TCP -LocalPort 3957 -Action Block
ufw
sudo ufw deny 3957/udp
iptables
sudo iptables -A INPUT -p udp --dport 3957 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3957 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3957' -Direction Inbound -Protocol UDP -LocalPort 3957 -Action Block

Related ports

3955p2pcommunity3956gvcp3958mqe-agent3959treehopper

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