Port 1433 — MS SQL Server
Quick reference for TCP/UDP port 1433, used by MS SQL Server. Includes what the service does, security guidance and related ports.
What is port 1433?
Microsoft SQL Server.
What port does MS SQL Server use?
MS SQL Server listens on port 1433 by default.
Security guidance
High risk — do not expose to the internet
Port 1433 (MS SQL Server) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Related ports
Frequently asked
What is port 1433 used for?+
Port 1433 is the standard TCP/UDP port for MS SQL Server. Microsoft SQL Server.
What port does MS SQL Server use?+
MS SQL Server listens on port 1433 by default.
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