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How Does Teamviewer Get Around Mac Firewall

How Does Teamviewer Get Around Mac Firewall Rating: 6,3/10 345 votes

Recently purchased and installed Total protection on a Mac Mini running Sierra (10.12.6). With FW enabled, I can not access the PC using screen sharing or TeamViewer. Network type is set to 'home' in FW settings. If I disable the firewall access works. If I enable the OSX FW, access works. Note: Teamviewer does not use inbound connections. Mar 27, 2016  That about sums it up. The only reason the other machine has to be on teamviewer is so it knows what to wake. You could TV into a remote machine and use wolcmd to wake any machine if you knew its mac address, or if you had any of the other various wake on lan utilities that are around online.

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  1. Teamviewer Firewall Requirements
  2. How Does Teamviewer Get Around Mac Firewall On Computer
  3. How Does Teamviewer Get Around Mac Firewall On Iphone

OS X v10.5.1 and later include an application firewall you can use to control connections on a per-application basis (rather than a per-port basis). This makes it easier to gain the benefits of firewall protection, and helps prevent undesirable apps from taking control of network ports open for legitimate apps.

At home, you can setup something called “Port Forwarding” on your home firewall to forward port 80 or 443 to 3389 which is the port that remote desktop listens on. Once your router is setup, simply launch your remote desktop client and connect to your PC on port 80.

Configuring the application firewall in OS X v10.6 and later

Use these steps to enable the application firewall:

  1. Choose System Preferences from the Apple menu.
  2. Click Security or Security & Privacy.
  3. Click the Firewall tab.
  4. Unlock the pane by clicking the lock in the lower-left corner and enter the administrator username and password.
  5. Click 'Turn On Firewall' or 'Start' to enable the firewall.
  6. Click Advanced to customize the firewall configuration.

Configuring the Application Firewall in Mac OS X v10.5

Make sure you have updated to Mac OS X v10.5.1 or later. Then, use these steps to enable the application firewall:

  1. Choose System Preferences from the Apple menu.
  2. Click Security.
  3. Click the Firewall tab.
  4. Choose what mode you would like the firewall to use.

Teamviewer Firewall Requirements

Advanced settings

Block all incoming connections

Selecting the option to 'Block all incoming connections' prevents all sharing services, such as File Sharing and Screen Sharing from receiving incoming connections. The system services that are still allowed to receive incoming connections are:

  • configd, which implements DHCP and other network configuration services
  • mDNSResponder, which implements Bonjour
  • racoon, which implements IPSec

To use sharing services, make sure 'Block all incoming connections' is deselected.

Allowing specific applications

How Does Teamviewer Get Around Mac Firewall On Computer

To allow a specific app to receive incoming connections, add it using Firewall Options:

  1. Open System Preferences.
  2. Click the Security or Security & Privacy icon.
  3. Select the Firewall tab.
  4. Click the lock icon in the preference pane, then enter an administrator name and password.
  5. Click the Firewall Options button
  6. Click the Add Application (+) button.
  7. Select the app you want to allow incoming connection privileges for.
  8. Click Add.
  9. Click OK.

You can also remove any apps listed here that you no longer want to allow by clicking the Remove App (-) button.

Automatically allow signed software to receive incoming connections

Applications that are signed by a valid certificate authority are automatically added to the list of allowed apps, rather than prompting the user to authorize them. Apps included in OS X are signed by Apple and are allowed to receive incoming connections when this setting is enabled. For example, since iTunes is already signed by Apple, it is automatically allowed to receive incoming connections through the firewall.

If you run an unsigned app that is not listed in the firewall list, a dialog appears with options to Allow or Deny connections for the app. If you choose Allow, OS X signs the application and automatically adds it to the firewall list. If you choose Deny, OS X adds it to the list but denies incoming connections intended for this app.

If you want to deny a digitally signed application, you should first add it to the list and then explicitly deny it.

Some apps check their own integrity when they are opened without using code signing. If the firewall recognizes such an app it doesn't sign it. Instead, it the 'Allow or Deny' dialog appears every time the app is opened. This can be avoided by upgrading to a version of the app that is signed by its developer.

Enable stealth mode

Enabling stealth mode prevents the computer from responding to probing requests. The computer still answers incoming requests for authorized apps. Unexpected requests, such as ICMP (ping) are ignored.

Firewall limitations

The application firewall is designed to work with Internet protocols most commonly used by applications – TCP and UDP. Firewall settings do not affect AppleTalk connections. The firewall may be set to block incoming ICMP 'pings' by enabling Stealth Mode in Advanced Settings. Earlier ipfw technology is still accessible from the command line (in Terminal) and the application firewall does not overrule any rules set using ipfw. If ipfw blocks an incoming packet, the application firewall does not process it.

TeamViewer is a powerful and incredibly useful application which allows you to remotely access and control any computer connected to the internet, Mac or Windows. The app is 100% free for personal, non-commercial purposes and compared to its competitors, I found it packed full of groovy features making it my new defacto standard for “family tech support” needs… With that said, let’s take a closer look at all the features as well as a few screenshots detailing what I like about it.

Main Screen

TeamViewer has a very clean interface without any unneeded features on display. From the main screen, you can do the two most basic features: either send your ID and Password to another person to let them gain remote access to your computer, or input another person’s ID and password so you can begin controlling their computer.

You can also create a TeamViewer username and password which allows you to control your PC’s (work or home pc) remotely with a click of a button. You can see this from the lower right side of the main screen called Computers & Contacts. I’ll detail this in later groovyPosts for you.

The lower left has a small traffic-light style indicator letting you know whether you are using a secure connection. The light turns yellow when someone is attempting to connect and is inputting the password.

From the main screen you can also access some of TeamViewer’s other features, such as the Meeting tab, the available extras, and you can even setup unattended access to control your computer while you’re away from home at any given time.

Remote Access

Above is a screenshot of TeamViewer being used to control another PC with TeamViewer installed. One nice thing about TeamViewer is it acts as a proxy to connect both sides of the connection. This way, no firewall rules need to be updated to allow the connections to be opened.

How Does Teamviewer Get Around Mac Firewall On Iphone

TeamViewer also automatically optimizes the quality of the screen sharing based on the connection quality on both ends. Testing it out with a friend who had a very very slow internet connection, TeamViewer performed flawlessly!

File Transfer

If your remote controlling someone’s PC with TeamViewer or if you just need to drop them a file, TeamViewer allows you to copy files from one machine to another easily. Here’s what File Transfer looks like on the remote computer once a file transfer is initiated. A log file will appear to inform the user a file is being transferred.

…and here’s what it looks like on the local computer initiating the transfer (a full file browser UI + log). Notice the Interface is very compact and simple to use. You can copy, move and delete files including creating folders if needed as well.

Recorded Sessions

Right next to the File Transfer option on the top menu of the local computer is the Extras button. From here you can access additional features, such as VPN, Taking a Screenshot, Performing a Remote Update and more. The feature which impressed me the most however, is the ability to record sessions.

After recording a session, you can save it in a TeamViewer specific format, which allows you to view it as long as you have TeamViewer installed. Luckily, you have the ability to convert your video to any traditional video format, as well as choosing an output resolution.

Both the recorded and exported videos look very good, with little difference from the original and with a fairly acceptable frame rate.

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Other Features

As we mentioned, TeamViewer packs a whole bunch of features, but since we won’t have time to cover all of them, here is a list of some other features which TeamViewer stands out with:

  • Instead of installing TeamViewer, once you download the installation file (exe/tar.gz) you can choose the “Run” option, which runs TeamViewer as a portable application – great for single time use on remote computers.
  • Built in VoIP functionality, chat, conference calls, and the option to add video via a webcam on any meeting or remote access session.
  • “Switch sides with partner” option, which can be triggered from the local computer – where the local computer instantly becomes the remote one and vice versa.
  • “Actions” menu – allows performing more advanced Windows actions, such as rebooting in Safe Mode, pressing Ctrl+Alt+Del, pressing Windows+L and so on.
  • You can register a free account in order to keep a list of different computers and contacts which can be accessed instantly after authorization
  • You can set a predefined password – useful when setting up unattended access or if you often need to use your computer remotely.
  • You have the ability to get past the Windows Logon screen once a user connects to the computer remotely (requires a password and needs to be additionally configured).
  • You can send invites to friends for TeamViewer meetings and remote access sessions via E-Mail with the pre-made E-Mail form.
  • TeamViewer is also available for Mac OSX, Linux and Mobile Devices like Android Tablets and Phones, as well as the iPad and iPhone. Groovy!

Conclusion

Keeping in mind it is free, it has a friendly UI, and it packs so many useful features, TeamViewer is definitely a must-try for any tech geeks or for anyone who uses remote access daily.