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.


MathWorks Support Team
MathWorks Support Team 2023-5-16,0:00
编辑:MathWorks Support Team 2023-5-16,22:01
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 Sometimes outdated AV can cause false positives.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?

  43 个评论
raihan 2023-2-28
编辑:Jan 2023-2-28
Computer or network security software is preventing the MathWorks Installer and/or Activation Client from connecting to the MathWorks servers.


更多回答(66 个)

Sean 2014-7-30
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.
  19 个评论


Brett Hansell
Brett Hansell 2019-10-8
  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.
  15 个评论


Brian Zarling
Brian Zarling 2015-2-16
I turned off my firewall and I still can't connect to Mathworks.
  6 个评论
Daniel Torres
Daniel Torres 2020-8-26
I was getting installation errors left and right. I did an internet speed test and saw I was pulling only 10MB. I relocated my wireless dongle, retested, 150MB. Tried again - installed successfully.
Seems the installer is persnickity with your download speeds.


Yehya Jebbaoui
Yehya Jebbaoui 2017-9-28
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.
  7 个评论


Gregg Casey
Gregg Casey 2017-12-29
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.
  4 个评论
Sam Kovnar
Sam Kovnar 2022-3-10
I had pretty much the same issue. Went through all the previous solutions, nothing worked. I was on a 5G network, so I switched to a different one and it worked fine. No idea why this fixed it, but I'm just happy it worked. It wasn't an internet connectivity thing - if anything, the second network I tried was a little bit slower than the previous one.


khalid Houhou
khalid Houhou 2018-2-28
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.
  10 个评论


Caitlyn Hampel
Caitlyn Hampel 2015-5-24
I had this problem as well, but I found that it was because my internet connection was too slow. So it only worked when I used a faster connection. Beware that the downloads during installation are rather large files, including the toolbox add-ons. Hope this information can be of help to others.
  3 个评论


Chris Håkansson
Chris Håkansson 2015-2-23
I had the same problem and followed all instructions above about filling in proxy-server information and deactivating the firewall etc. but nothing worked. Turned out all I needed to do was uncheck the box which indicates to use a proxy server. It is as mentioned in other links found in Control Panel/Internet Options/Connections/Lan Settings.
  4 个评论


Donald Niman
Donald Niman 2015-2-23
This is what I did to successfully install Matlab (Home Use) on my Windows 7 x64 SP1 system. Note that I do not know which one of the following things helped to make things work; I just did all of them. Also note that I am not using a proxy server, if you are, this will probably not help you.
1. Turned off internet router and then turned it back on.
2. Restarted the PC in Safe Mode.
3. If applicable to you: The installation file was on hard drive volume D:\ and I moved it to C:\
4. From control panel->administrative tools->Services, I right-clicked "Windows Firewall" and selected "Stop".
5. I ran the Matlab installation file from c:\.
6. When the installation screen came up, I did not click on the button at the top right of the dialog. Instead, I clicked the "next" button at the bottom. (Of course, I am not using a proxy server.)
7. A dialog appears to enter your login credentials: do that and the installation will continue.
8. The installation will eventually complete and then you can activate it by following the on-screen directions.
9. I restarted the system normally and verified that Matlab was working.
(Hopefully, I did not leave anything out.)
  5 个评论


Jon 2014-12-16
On a Mac (running 10.10 [Yosemite]) I still needed to temporarily disable the Firewall (under System Preferences > Security & Privacy) in order to complete activation.

Anna Smirnova
Anna Smirnova 2018-7-1
Error : unable to connect to host. sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Windows 7 64-bit. What am I doing wrong?

Jiawei Meng
Jiawei Meng 2020-5-15
Guys, I just tried 16 times....Yes, I counted it and now it works. So don't give up....
However, I don't whether it is because my internet connection is bad or not? Because I literally changed nothing....

Matthias Finsterbusch
I am trying to install Matlab 2018b on a Win10 64bit System, getting the following error:
"Error : unable to connect to host. sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"
Any instructions how to handle this problem? Thanks in advance.

Dewi Mar'a
Dewi Mar'a 2018-11-20
I am dealing with the same problem. After almost a week I tried to install matlab more than hundred times, then I got no solution at all. My windows firewall was off, no proxy setting, no anti virus installed, even no matlab installed yet.
I am getting deperate with this problem because my deadline project comes closer, and I wasted the time too much to deal with this problem.
finally I end up with the last solution left, I tried to uninstall my windows, and try to install matlab again. BAAAAMMM....it works. do anything to get out of this stuck step. if it ends with great result, why not ? haha

Jan 2019-3-14
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.
  3 个评论
Ani Padma
Ani Padma 2020-7-11

Thanks a lot Jan, I tried all other suggested solutions with no success...I was even considering upgrading my laptop to a new one thinking it might be a hardware issue.However, this environment variables solution worked for me...Phew!!


ismail tepedag
ismail tepedag 2019-1-14
Hey guys, I read everything and closed antivirus , firewall etc...
Then it did not work.
I tried repeatedly some 10 times then it worked miracleously. ?!
As a result, try try try...

Ceren Yurdakul
Ceren Yurdakul 2021-1-3
I had the connection error. I literally tried every solution that people suggested above for days and non of them worked for me. I finally solved it like this:
I connected to the celluar data from my phone instead of WiFi. After using my phone's internet I chose my destination file and clicked next, it started downloading. Then I changed back to WiFi to avoid wasting my phone's internet and it continued downloading anyway.
That's how I fixed my connection error. I hope it works for yu too.

Christopher Silva
Christopher Silva 2021-4-12
I tried absolutely all the solutions that were up but nothing worked for me (I have macOS Catalina 10.15.7). However, what apparently worked for me was very simple. All you have to do is go to "System Preferences", then go to the logo "Java" (if you don’t have Java, download it here: https://www.java.com/en/download/). After that, a configuration window will open, then you go to "General", then "Network Settings" and change it to "Direct Connection".
Pd: make sure you update Java before this.
Pd2: if like me, you tried all (literally all) the solutions in the above entries and nothing worked, and this solution either did or did not serve you because it was already configured with "Direct Connection", I think you should contact mathworks support.