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macOS User Guide
- Welcome
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- Use Continuity across your devices
- Use your iPad as a second display
- Hand off between devices
- Insert photos and scans from iPhone or iPad
- Insert sketches from iPhone or iPad
- Copy and paste between devices
- Use Apple Watch to unlock your Mac and approve requests
- Make and receive phone calls on your Mac
- Control accessories in your home
- Send files between devices with AirDrop
- Use AirPods with your Mac
- Stream content to Apple TV
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- Understand passwords
- Use keychains to store passwords
- Reset your Mac login password
- Set up your Mac to be secure
- Guard your privacy
- Protect your Mac from malware
- Use Sign in with Apple for apps and websites
- Clear your Safari browsing history
- Manage cookies and other website data in Safari
- Find a missing device
- Resources for your Mac
- Resources for your Apple devices
Check for open TCP ports using Network Utility on Mac
TCP/IP communications between your computer and other computers on the internet pass through numbered logical ports on each computer.
Knowing which ports are open on your computer can help you assess the security of your system or troubleshoot connection problems.
On your Mac, open the Network Utility app , located in the /System/Library/CoreServices/Applications folder.
Click Port Scan, enter your IP address, then click the Scan button.
To find your IP address, choose Apple menu > System Preferences, click Network, then select a network service, such as Ethernet or Wi-Fi.
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