Why do I receive MathWorks Licensing Error 9?
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Why do I receive the following error:
MathWorks Licensing Error 9
A licensing error occurred while trying to use <PRODUCTNAME>.
The host ID in the license file does not match your computer's host ID.
or
MathWorks Licensing Error 9
A licensing error occurred while trying to use <PRODUCTNAME>.
Your username is not authorized to use this license.
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MathWorks Support Team
2025-12-9
编辑：MathWorks Support Team
2025-9-5
362 个投票
MathWorks Licensing Error 9 may be caused by various reasons:
- The username or Host ID in the license file does not match
- (Designated Computer Only) MATLAB is already running under a different user account
The username in the license file does not match
This error occurs when the OS username of the user launching MATLAB does not match the username that was used during activation. This most often occurs when an administrator activates MATLAB for a user.
To determine your OS username:
- Windows: Open a command prompt and enter "set username"
- Mac and Linux: Open a terminal window and type "whoami"
To resolve, reactivate MATLAB with the correct username.
Note: Usernames are case sensitive and may not be recognized if they contain spaces.
The Host ID in the license file does not match
To resolve this, verify the Host ID (MAC address) of the machine, then reactivate MATLAB. If your machine has a variable Host ID, configure your system to have a static Host ID, and then reactivate MATLAB.
MATLAB is already running under a different user account
With Designated Computer licenses, MATLAB can only be running by one user account on the machine at a time. If there is already a MATLAB process running under a different user, MATLAB issues MathWorks Licensing Error 9.
To resolve this, end the MATLAB process on the other user account. This can be done by restarting the computer.
24 个评论
lis coffey
2016-6-23
编辑：MathWorks Support Team
2018-2-13
I would recommend you reactivate MATLAB to your normal user account by running the "activate_matlab.sh" script in the /bin/ directory of your MATLAB installation directory, and providing your standard username when prompted.
Walter Roberson
2016-9-6
Max Ligthart comments
I don't see my activation tool anymore but I have the same problem. can you help me?
Walter Roberson
2017-2-23
Surendar Poongavanam comments to Darren Reynolds:
This Helps ! Thanks
Walter Roberson
2017-10-26
Veronika, is it possible that your ethernet card changed? Or that you are using a slightly older MATLAB and your Linux is using the new universal device naming system?
Walter Roberson
2018-6-11
Contact Mathworks for free installation support.
Note: if you are using Windows 10, some people have been reporting that MATLAB will not launch for them; I do not happen to recall what the causes of that turned out to be.
Walter Roberson
2018-6-13
编辑：MathWorks Support Team
2022-10-26
Walter Roberson
2018-12-12
In the last step where you are activating and need to tell it the name to activate for, be sure to use the same as the output of
whoami
for the user who will be using MATLAB. Do not use root as the name.
Walter Roberson
2019-11-11
The volunteers who answer questions here do not have access to the licensing database. You should contact Mathworks for free installation support.
Walter Roberson
2019-11-17
Contact Mathworks for free installation support.
Walter Roberson
2020-3-18
Matteo, which link are you referring to as not being able to find?
Walter Roberson
2020-3-19
For R2019b it would be
C:\Program Files\MATLAB\R2019b\bin\win64\activate_matlab.exe
Walter Roberson
2020-4-23
You probably activated for your own username. When you sudo you temporarily become a different user.
Shervin Sahba
2020-5-5
This works for me. However, the same error seems to intermittedly reappear on the same system. I'm on a Manjaro Linux 5.4 system running R2020a via my student license.
Any idea as to what is changing my hostid? From what I understand, the hostid is tied to my network interface's MAC address... and I don't understand why that would change.
Walter Roberson
2020-5-5
Any reasonably current version of MATLAB for Linux should be able to use any of its interfaces; https://www.mathworks.com/matlabcentral/answers/101892-what-is-a-host-id-how-do-i-find-my-host-id-in-order-to-activate-my-license
I have seen security software that randomizes the user's MAC to reduce tracking; that would interfere with license managers.
Walter Roberson
2020-6-19
Cristhian Jadan : you already tried contacting Mathworks Support, but they were not able to find a solution for you?
Walter Roberson
2021-1-3
To launch the activation client on Linux, go into terminal ( https://maker.pro/linux/tutorial/basic-linux-commands-for-beginners ) and cd to the appropriate directory such as /usr/local/MATLAB/R20XXx/bin . Once there,
sh ./activate_matlab.sh
You might possibly need
sudo sh ./activate_matlab.sh
Walter Roberson
2021-1-3
There is no problem at all using the same Mathworks account or the same license with two different OS.
However, each different kind of license has a limitation on the number of simultaneous activations that you can have on different hardware. Not different OS. If you dual boot then unless you used a fairly old MATLAB for WIndows (that keyed off the disk serial number) then MATLAB will notice that the MAC addresses are the same and will permit the activation.
(If you use a virtual machine that uses a different MAC address, then you could end up "using up" an activation as MATLAB might consider them to be different machines.)
Image Analyst
2021-2-2
What is the specific "windows link" you clicked on? You forgot to tell us. Regardless, call tech support and get a live person on the phone. All installation tech support is fast and free (even for students), so do it now.
Walter Roberson
2021-6-8
Do you mean that you get Permission Denied when you ask Windows Explorer to go to the directory that contains the activation client?
Do you mean that you can navigate to the activation client, but you get a permission refusal for running it?
Do you mean that you are able to run it, but it says it does not have access to the destination location? If so then you might need to Run as Administrator.
Walter Roberson
2021-8-1
If the debugging steps here and in https://www.mathworks.com/matlabcentral/answers/99067-why-do-i-receive-license-manager-error-9#answer_213381 did not help, then you will need to contact Mathworks for free installation support.
Walter Roberson
2021-10-3
The number of cracks available for various MATLAB versions shows that a significant number of users cannot be trusted .
Walter Roberson
2021-10-3
A few years ago, we had one student openly discussing how a class of about 30 students got together and bought one MATLAB Student license, put it on USB drive, and passed it around from person to person. That had been going on for several years, apparently. We have also had people ask whether it would be possible to do pretty much the same thing.
We have had people in business discuss that they set up an automated task to reboot the license server every hour, to avoid having to buy more licenses (that is, they had more demand than they had licenses, so they would log everyone out of MATLAB and let there be a rush to get access to the now-freed licenses.)
We have had people ask how to reduce the license "idle timeout" as low as two minutes, to avoid having to buy more licenses (very high demand for licenses compared to the number they were willing to pay for.)
On other sites, I have seen people who crack MATLAB licenses and actively encourage people to use the cracked licenses because they believe that Mathworks is effectively "stealing" from the world by charging anything for licenses.
Not long ago, I had a discussion with a student who was of the opinion that because going to university is expensive, and some professors required MATLAB, that Mathworks was ripping students off by charging anything for MATLAB. The students choose to take those courses; the professors choose to require MATLAB, but apparently Mathworks is to blame for not providing everything for free.
But, hey, it's Mathwork's fault for not trusting the users, right?
Walter Roberson
2021-10-15
People have also argued that it is the university's responsibility to aupply textbooks that are required for courses.
Unfortunately, in some countries, especially with private universities, some universities seem to specialize in wringing money out of students. Fees for everything.
IIRC, way way back there was a modest lab fee for one of my chemistry courses. Computing courses that require non-commercial software licenses but don't want to buy campus licenses, but are required to provide the software, would just charge the costs back as a "lab fee".
更多回答（5 个）
Dandan Zhang
2016-3-12
编辑：MathWorks Support Team
2025-10-29
134 个投票
Note: It's your Windows User Name rather than Microsoft Account Name.
You can determine your Windows username as follows:
- 1.While sitting at the host computer with press and hold the Windows key and press the letter R on your keyboard.
- 2.The Run box will appear.
- 3.In the box, type cmd and press Enter. The command prompt window will appear.
- 4.Type echo %username% and press Enter. (there is a space between echo and %username%)
- 5.Your current username will be displayed.
2 个评论
Walter Roberson
2017-3-29
See the above on "How do I activate MATLAB?".
After you enter your Mathworks account information, you will get a window asking which user name will be used to run the program; enter your windows username at that place.
Walter Roberson
2021-8-29
Windows-R . When it brings up the small box to type in a command, use the command
cmd
This will cause a full cmd.exe to be launched. When that comes up, at the (Windows) command window, enter the command
echo %username%
The echo does not go into the MATLAB command window; it goes into the Windows command window.
(You can bring up Powershell instead of cmd if you prefer.)
Miguel Angel Benavides Morales
2020-6-4
35 个投票
Para usuarios de windows 10 Home single language: Presionar la tecla windows, buscar Matlab, en la parte inferior debajo de la pestaña aplicaciones debe aparecer Activate MATLAB. Luego ingresar con usuario y contraseña, darle activar licencia y dejar el nombre del usuarios como aparece (por cambiar ese nombre al momento de la instalación o cambiar el nombre de usuario o de usuario en el pc es que aparece el error), luego seguir los pasos de activador y listo.
Scott Ruffner
2017-2-25
编辑：Scott Ruffner
2017-2-25
28 个投票
I was able to fix the error on my MacBook Pro with the advise above from Scott on the MathWorks Installation & Licensing Support team. I've added a few tips and step by step clarifications for others that may have the same issue.
I was receiving the -9 error. I'm running OS X Yosemite 10.10.5
It seems that you need to know which user on your Mac you are using. To find this out open a terminal window and type "whoami". Copy that result. You will need that at last step of the activation process.
I installed MATLAB in the /Applications folder.
In the terminal window go to wherever you installed MATLAB and find the bin sub-directory. For me this was /Applications/MATLAB_R2016b.app/bin
In the terminal I ran the activation script again by typing "./activate_matlab.sh"
Then I went through the steps "Login to MathWorks" [email/password] >> Next Selected the pre-selected license. >> Next Provide a user name/Login Name: (Paste the user name that you copied when you ran whoami above.)
Then open a new finder window go to Applications and try to run MATLAB_R2016b. It opened this time without errors hope this helps.
Note for Linux users: when I installed MATLAB on my Manjaro OS, I was required to have 'root' as my username, rather than my actual username.
The solution to this (if you're using a terminal, which is the only way I can access MATLAB), is to open MATLAB as 'root' by entering 'sudo su' (which changes you to root), and then typing 'matlab'.
P.S. The '' marks on words and phrases like 'root', 'sudo su' and 'matlab' are written in this post just to highlight the specific terms and commands. Quotes ('') should not be included when inputting commands into the Terminal.
2 个评论
Walter Roberson
2016-10-22
Lovuit Chen comments to Scott:
This helps!! Thanks
Luis Ignacio Gómez-Jordana Martín
2019-1-12
It work mate. I love you. You save my night, going to sleep finally XD
Andrew Janke
2019-10-3
7 个投票
Ouch, dude. That's not a great user experience. I got this same problem when I upgraded my iMac to a newer hardware version. Props to you for the "Troubleshoot" button bringing up this (relevant, correct) answer, but seems like the license transfer process could be made easier, especially for the case of restoring a computer from backup to new hardware.
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