localhost:1433: what runs on it and how to open it
Port 1433 is the default port of Microsoft SQL Server. How to connect and fix connection errors.
Not a web pagePort 1433 is Microsoft SQL Server. Use a database tool, not a normal browser tab.
localhost:1433 is not a web page. It is the port Microsoft SQL Server listens on for database tools such as SSMS, Azure Data Studio and sqlcmd.
What runs on localhost:1433
- Microsoft SQL Server and SQL Server Express
- SQL Server in Docker published on 1433
Commands to start and test port 1433
sqlcmd -S localhost,1433 -U sadocker run -d -p 1433:1433 -e ACCEPT_EULA=Y -e MSSQL_SA_PASSWORD="Change-me-123" mcr.microsoft.com/mssql/server:2022-latestTest-NetConnection localhost -Port 1433Find what is using port 1433
Run these in a terminal on your computer. Nothing is sent to this site.
If localhost:1433 will not open
- Login failed for user sa
- Check the password and that the sa login is enabled. SQL Server also requires a strong password.
- A named instance does not answer on 1433
- Named instances such as SQLEXPRESS often use a dynamic port. Check SQL Server Configuration Manager under TCP/IP.
- Port 1433 is already in use
- Another program is on this port. Find it with the tool below and stop it, or start yours on another port.
- Connection refused on port 1433
- The service is not running, or it listens on another port. Start it and check the port in its settings.
Other ports like 1433
| Port | Usually used by |
|---|---|
| localhost:3306 | MySQL, MariaDB |
| localhost:5432 | PostgreSQL |
| localhost:27017 | MongoDB |
| localhost:6379 | Redis |
| localhost:11211 | Memcached |
| localhost:5984 | CouchDB |
| localhost:8983 | Apache Solr |
Questions about localhost:1433
- Why does the browser show nothing?
- SQL Server speaks its own protocol, not HTTP. Use a database tool.
- Is localhost:1433 safe?
- Yes, as long as it stays on localhost. Only your own computer can reach it. It becomes reachable from other devices only if you start the program on 0.0.0.0 or your computer's IP address. Do not put development or admin tools on the public internet.
- Can I use a different port instead of 1433?
- Yes. Most programs let you choose the port with a setting or a command option. Pick a free port above 1024 and open that number instead.
- How do I check what is using port 1433?
- Use the port checker on this page. It shows the command for Windows, macOS and Linux and does not send anything to this site.
- Can I open localhost:1433 from my phone?
- Yes, if both are on the same Wi-Fi. Start the program so it listens on all addresses, then open your computer's IP address with the port on the phone. A firewall on the computer can still block it.
Free tools that help
- Common ports listSearch a list of common TCP and UDP port numbers: SSH 22, HTTP 80, HTTPS 443, MySQL 3306, PostgreSQL 5432 and more, with dev server ports.