CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Databases & caches

Port 1434: Microsoft-SQL-Monitor

Port 1434 is assigned by IANA to ms-sql-m (Microsoft-SQL-Monitor).

1434

How ms-sql-m works

Databases & caches
app:1434ms-sql-m app:1434ms-sql-m

The application sends a SQL query to the ms-sql-m server on port 1434, which returns rows from its tables.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Databases & caches
01 Security

Is port 1434 dangerous?

We have no specific security note for port 1434. Its risk depends on the program actually listening on it. General advice for databases & caches services:

  • Bind the service to localhost or a private network, never to a public address.
  • Enable authentication, use per-application accounts and require TLS.
  • Watch for exposed Docker ports: publish them on 127.0.0.1 only.
02 Registry

IANA registry entries for port 1434

ServicePortTransportDescriptionReferenceUpdated
ms-sql-m 1434 TCP, UDP Microsoft-SQL-Monitor - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1434, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1434'      # process listening on 1434
sudo lsof -nP -i :1434

macOS

sudo lsof -nP -i :1434

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1434 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1434
netstat -ano | findstr :1434

From another machine

nmap -p 1434 -sV <host>
sudo nmap -sU -p 1434 <host>
nc -zv <host> 1434

Block it in the firewall

sudo ufw deny 1434/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1434" -Direction Inbound -LocalPort 1434 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1434 used for?

Port 1434 is assigned by IANA to ms-sql-m (Microsoft-SQL-Monitor).

Is port 1434 TCP or UDP?

Port 1434 is registered for TCP and UDP.

Is it safe to open port 1434?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Bind the service to localhost or a private network, never to a public address.

How do I check if port 1434 is open?

On Linux run "ss -ltnup 'sport = :1434'", on macOS "lsof -nP -i :1434", and on Windows "netstat -ano | findstr :1434" to see the local process. From another machine, "nmap -p 1434 <host>" shows whether it is reachable.

05 Related
:3306 MySQL / MariaDB tcp · udp · high risk :1433 Microsoft SQL Server tcp · udp · high risk :5432 PostgreSQL tcp · udp · high risk :6379 Redis tcp · critical risk :27017 MongoDB tcp · critical risk :9200 Elasticsearch tcp · udp · critical risk :1521 Oracle Database tcp · udp · high risk :11211 Memcached tcp · udp · high risk

Latest vulnerability news

All news