Why do I get a connection error when installing or activating MATLAB or other MathWorks products?

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I get an error that I cannot connect to MathWorks when running the MathWorks installer or the activation client; however, I can access the website. Why can't the MathWorks Installer or activation client connect to the MathWorks?
Connection Error
The application could not connect to MathWorks.
For more information on resolving this issue, see this Support Article.

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 16 May 2023 at 0:00
Edited: MathWorks Support Team on 16 May 2023 at 22:01
Computer or network security software is preventing the MathWorks Installer and/or Activation Client from connecting to the MathWorks servers. This is known as a connection issue due to one or more of the following: 
  • Antivirus Software
  • VPN
  • Proxy
  • Firewall
  • Date and Time

Antivirus Software

Update your antivirus software (AV): Ensure that your AV is up to date with the latest virus definitions and software updates. Sometimes outdated AV can cause false positives. This will most likely require speaking with your internal IT.
To temporarily disable your Antivirus on Windows:
  1. Locate the Antivirus protection program icon on the Windows system tray.
  2. Right-click the icon and select Disable, Stop, etc. to temporarily disable the program. In some cases, you may need to open the program and disable it using the program's menus.
 To temporarily disable your Antivirus on a Mac:
  1. Locate the Antivirus icon found on your Mac menu bar.
  2. Click Shut down or disable temporarily until installation and activation have completed.
You may also find these settings in the System Preferences application under the Security & Privacy tab.
To temporarily disable your Antivirus on Linux:
  1. Locate the Antivirus protection program icon on the Linux system tray.
  2. Click Shut down or disable temporarily until installation and activation have completed.


Some Virtual Private Networks (VPN) will interfere with the installer working correctly. If you have one, try disabling it and then running the installer again. Disabling it will vary depending on what VPN you are using. Refer to your VPN's documentation if you are unsure how to do this.


The MathWorks installer, activation client and update installer will try to automatically inherit your user proxy settings on Windows and MacOS.
To disable your Proxy in Internet Explorer:
  1. Click the Tools button and then select Internet Options.
  2. Click the Connections tab and then select LAN settings.
  3. Uncheck the check box for Use a proxy server for your LAN.
To disable your Proxy in Chrome:
  1. Open the Customize and Control Google Chrome menu by clicking on the three-dots icon at the top right of Google Chrome, select Settings on the right, find Advanced and finally select open proxy settings.
  2. Select the LAN Settings button.
  3. Deselect the checkbox for Use a proxy server for your LAN.
To disable your Proxy in Safari:
  1. Go to Menu and click on Preferences from the drop-down menu.
  2. Select the Advanced tab and then click on the Change Settings button.
  3. Deselect the checkbox for Use a proxy server for your LAN.
To disable your Proxy in Firefox:
  1. Click the Tools button and select Options.
  2. Go to the Advanced panel and select the Network tab.
  3. Click on Settings in the Connection Section and select No Proxy.
You will need to contact your IT Help Desk to troubleshoot this issue if you don't know your proxy settings or the error persists after entering your proxy settings.


You will need to contact your IT Help Desk if your organization is running a network firewall to configure it to bypass blocked connections to the MathWorks servers.The MathWorks installer needs to contact MathWorks servers on the following ports and addresses:
  • mathworks.com
  • licensing.mathworks.com
  • login.mathworks.com
  • services.mathworks.com
  • TCP ports 80 and 443
Your firewall needs to bypass blocked connections for both addresses over both ports. These servers do not use a Static IP Address and will resolve to a Dynamic IP Address. This means that users will not be able to white-list MathWorks servers via IP Address and will have to use the domain name. 

Date and Time

If the date and time of your computer is wrong, you may encounter a "Connection Error" after clicking next on the destination screen during installation. To fix this issue, change the date and time on your computer to the correct date and time.

Offline procedures

To bypass connection errors when installing or activating MATLAB, you may perform an offline installation or activation. For instructions on performing either, please refer to the relevant support article before:

How can I install MATLAB or other MathWorks products on an offline machine

How do I activate MATLAB or other MathWorks products without an internet connection?

For information on performing an offline installation of an update or support package:

How do I Download and Install a Support Package on an Offline Machine?

How can I download and install a MATLAB Update manually?


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More Answers (10)

Sean on 30 Jul 2014
When I received this error, it was not due to proxy settings or firewall settings. Rather, when I downloaded the installer, the download location was on a remote drive (a windows remote profile DFS location). I copied the setup file to the local drive, and it ran fine.
  1 Comment
Walter Roberson
Walter Roberson on 24 Jan 2020
Which drive are you asking about, Rojitha Goonesekere ?
Try looking in ~/Downloads/MathWorks/R2019b/ perhaps? That is where the installer tosses the installation program and archives .

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Brett Hansell
Brett Hansell on 8 Oct 2019
  1. Under System Variables, select New.
  2. Set the first variable name "JAVA_TOOL_OPTIONS" with the value of "-Djava.net.preferIPv4Stack=true" (enter these without the quotation marks)
  3. select New again.
  4. Set the second variable name "JAVA_OPTIONS" with the value of "-Djava.net.preferIPv4Stack=true" (enter these without the quotation marks) and click on OK
  5. Click OK again on the previous screen and try the installer again.

Brian Zarling
Brian Zarling on 16 Feb 2015
I turned off my firewall and I still can't connect to Mathworks.

Yehya Jebbaoui
Yehya Jebbaoui on 28 Sep 2017
Turn off the Wifi of the institution you are in, then turn on Mobile hotspot on your phone to share the mobile connection (if you have 3G or 4G). You will pass the first steps and it will start downloading. When it starts downloading, switch to the wifi. It worked for me.

Gregg Casey
Gregg Casey on 29 Dec 2017
Had the same problem on my Mac and I have never had a problem like this on a Mac since I have used them. (Probably more than 8 years.) My laptop did not have the firewall turned on at all during all attempts. So this is probably just badly written software from Mathworks. What worked for me is to use my hotspot. That is all I changed - connect to my Karma hotspot and click "Next" again. Done. Note that I first did the same after connecting to my iPhone as a hotspot and that did not work. (Just clicked "next" and got the same error message.) However, that could have been that my phone was having a connection issue.
Mathworks- please look into this issue and fix it. The software should not require special proxy settings.

khalid Houhou
khalid Houhou on 28 Feb 2018
I had this issue and it was not related to any network or connection. It was caused by a Malware I had in my PC called relevantknowledge. I uninstall it and it worked.

Jan on 14 Mar 2019
Create the two environment variables
  • "JAVA_TOOL_OPTIONS" with the value "-Djava.net.preferIPv4Stack=true"
  • "JAVA_OPTIONS" with the value "-Djava.net.preferIPv4Stack=true"
Run the installer. Afterwards the variables can be removed.

Walter Roberson
Walter Roberson on 17 Apr 2021
Data point for MacOS Catalina:
I have not had difficulty downloading or authenticating to Mathworks until just now. I was installing R2017b onto MacOS Catalina; the download worked, but when I went to register the license, it gave me an error message (that linked to this topic.)
I looked in MacOS security settings, and reviewed everything, but did not find anything relevant. I did happen to notice that my Kensington Trackball manager was blocked from accessing the network, so I authorized that, but I really doubt that made any difference.
I went back to try the authentication again, and this time it worked without problem.
I don't think authorizing the trackball was at all relevant; I think it was just the trying again that made the difference.
  1 Comment
Walter Roberson
Walter Roberson on 25 Apr 2021
I just had the same problem for R2016a -- first authentication attempt said that it could not connect to Mathworks, second authentication attempt worked fine.

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Juan Felipe Tapia Palacios

How To Fix Connection Error I can solve this issue.

Dilaways Hassan
Dilaways Hassan on 14 May 2023 at 10:18
matlab is not working why?


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