Database
Risk: High
Port 1433 — Microsoft SQL Server (MS SQL)
Port 1433 is the official standard port assigned for Microsoft SQL Server instances.
PORT NUMBER
1433
PROTOCOL
TCP
DEFAULT PROCESS
sqlservr.exe
FIREWALL TARGET
1433/tcp
Instant Terminal Fixes for Port 1433
macOS & Linux Terminal
1. Check who is listening on port 1433:
sudo ss -tulpn | grep 14332. Kill process occupying port 1433 (EADDRINUSE fix):
sudo systemctl stop mssql-server3. UFW Firewall Allow rule:
sudo ufw allow from 10.0.0.0/8 to any port 1433 proto tcpWindows PowerShell (Admin)
1. Check listening port:
Get-NetTCPConnection -LocalPort 14332. Force kill process on port 1433:
Stop-Service MSSQLSERVER -Force3. Docker Port Forwarding Mapping:
docker run -p 1433:1433 -e ACCEPT_EULA=Y -e SA_PASSWORD=YourStrong@Pass -d mcr.microsoft.com/mssql/server:2022-latestCommon Error Encountered
Cannot open database requested by the login. Connection to localhost:1433 failed.
Security Advisory & Hardening
Frequently targeted by SQL brute-force attacks. Disable the `sa` account or assign a 25+ character random password, and enable SQL Server audit logging.
Frequently Asked Questions
Port 1433 Questions & Answers
Common questions regarding default services, kill commands, and firewall configurations.
Port 1433 is commonly used for Microsoft SQL Server (MS SQL). Port 1433 is the official standard port assigned for Microsoft SQL Server instances.