Why do I receive License Manager Error -95?

Why do I receive the following License Manager Error?

License checkout failed.

License Manager Error -95

MATLAB is unable to connect to the license server.

Make sure you can resolve the hostname of your machine.

Answer 1

[MathWorks Support Team]

License Manager Error -95 indicates that MATLAB cannot resolve the hostname of the computer that is running the network license manager.

This issue can occur even if the license manager is running.

To verify that the license file contains a resolvable hostname, open the license file in a text editor. The license file location varies depending upon operating system and version:

Windows: C:\Program Files\MATLAB\R20***\licenses\network.lic
Linux: /usr/local/MATLAB/R20***/licenses/network.lic
macOS: /Applications/MATLAB_R20***.app/licenses/network.lic

In the license file will be a line that starts with the word SERVER followed by the hostname of the license server or the IP address of the license server. Generally this issue occurs when there is a hostname present and that name is not resolvable.

For local license managers, you may also see the term "this_host". This means that the license manager will use the current hostname. This hostname can be retrieved by running the command "hostname" from a terminal or command prompt.

To confirm that the hostname is resolvable:

• Open command prompt or terminal
• Run the following command (replace "hostname" with hostname of license server)

ping hostname

If the output of the command is "unknown host", MATLAB will not be able to connect to the license manager. You will need to change the hostname listed on the SERVER line of the license file, or use the IP address of the license server.

If the license manager is running locally, you can resolve this issue by making the hostname resolvable. To do so, you can modify the system's host file. Please check with your IT department before modifying your hosts file.

C:\Windows\system32\drivers\etc\hosts (Windows)
/etc/hosts (Linux/Mac)

To make the hostname resolvable, add it to the loopback address line. Generally this line ends with the value localhost or localhost.localdomain. For example, you should see a line with the following:

127.0.0.1 localhost localhost.localdomain

or

::1 localhost localhost.localdomain

To make the local hostname resolvable, add it to the end of this line. For example:

127.0.0.1 localhost localhost.localdomain john-pc

Once added, if you restart the local license manager, you should be able to start MATLAB. If the license manager is not running locally contact your network administrator for assistance with ensuring that the license server machine is resolvable.

[Abzal Nurgaliyev]

It idesn't allow me to change the 'hosts' file? I tried to change Properties, but it didn't work. Who knows how to deal with it?

[Walter Roberson]

"It idesn't allow me to change the 'hosts' file? "

If you are using Linux or Mac, you will need to go to a terminal window and sudo to edit the hosts file.

If you are using MS Windows then see https://docs.microsoft.com/en-us/troubleshoot/windows-server/networking/cannot-modify-hosts-lmhosts-files or https://petri.com/easily-edit-hosts-file-windows-10

[mohammed durvesh]

127.0.0.1 localhost localhost.localdomain john-pc it won't work for me.Is there anyother way

[Walter Roberson]

Could you explain further about "it won't work for me" ?

Which operating system are you using, and what symptoms are you seeing?

[Colin Fraser]

@mohammed durvesh

If you need further support, open up a support ticket with us.

https://www.mathworks.com/support/contact_us.html

-Colin

[erbold baterdene]

"License Manager Error -95 matlaw cannot working

[Walter Roberson]

erbold baterdene were you able to find your network license file, and see which host name was configured there for the license server? Were you able to ping that host? Were you able to edit the hosts file to add an entry mapping the host name to its IP address?

[Muhammad Ahmad]

i have change the host file but still same error please help..

[Colin Fraser]

@Muhammad Ahmad

If you are still experiencing this issue, please create a service request below.

https://www.mathworks.com/support/contact_us.html

-Colin Fraser

Answer 2

[junaid tariq]

My matlab app is not working giving errors related to server which is visible in the image.

[Walter Roberson]

See https://www.mathworks.com/matlabcentral/answers/95791-why-do-i-receive-license-manager-error-95

[Muhammad Hilmi]

i wrong input the license

[Cody Lamke]

Hello,

If you are still experiencing this issue, please contact MathWorks support:

http://www.mathworks.com/support/contact_us/

-Cody Lamke

Answer 3

[Sandive Direckszes]

Help I'm experiencing licensing error 95, 378 I did everything as the guide above but still no pls help

[Walter Roberson]

were you able to find your network license file, and see which host name was configured there for the license server? Were you able to ping that host? Were you able to edit the hosts file to add an entry mapping the host name to its IP address?

Answer 4

[Veena Pani]

problem with activation

Answer 5

[Veena Pani]

getting error 95

[Colin Fraser]

If you are still experiencing this issue, please create a service request below.

https://www.mathworks.com/support/contact_us.html

-Colin Fraser

Answer 6

[davut sevim]

5XXXX-XXXXX-XXXXX-XXXXX-XXXXX

[Walter Roberson]

Activation keys do not have anything to do with error 95; error 95 is only about host name resolution.

Answer 7

[UMMADI BRAMHAIAH]

sir i am student please provide matlab

[Walter Roberson]

Only Mathworks and authorized Redistributors are authorized to provide MATLAB. If I were to give you access to my copy of MATLAB then I would lose my license.

Error 95 has to do with network license servers being run by your organization. You need to talk to the IT people at your organization about the problem.

Answer 8

[Mostafa Mahamoud]

actvation the program please

[Walter Roberson]

Please provide more information about the difficulty you are encountering.

Note: the volunteers who answer questions here do not have access to the Mathworks license database, so we cannot provide activation keys.

Answer 9

[Zarwish Javaid]

what to do with this dialogue box?

and my matlab is not working even I have done the hostname thing

[Muhammad Ahmad]

Was MATLAB working for you before ?

[Muhammad Ahmad]

Or its just not working after installation?

[Zarwish Javaid]

I have just installed it and it is not working

[Muhammad Ahmad]

I was having the same issue ... i install MATLAB in my mac 3 times and it pop up the same error each time and i also change host name etc but nothing worked.. then i read a text file which is downloaded with MATLAB setup.. there i read that a file at specific location has to be replaced with the new one downloaded with Setup file .. after replacing that file MATLAB is running now

[Muhammad Ahmad]

If you download the setup there must be an installation guide file or something.. read it carefully

[Zarwish Javaid]

yes I have done that replacing thing.....but can you explain in detail that which file have to be copied or replaced in which diresctory or folder....I will be thankful

[Muhammad Ahmad]

I actually don’t remember the exact file directory.. but i read the installation guide many times ..all details was given there, that which file is to to be replaced.

Answer 10

[Asad Shamim]

detail licence

[Walter Roberson]

This error is not related to your license. This is an error that occurs for people who are using network licenses to use a license provided by a business or university, and it only occurs when the name of the licence server in the license file cannot be resolved into an ip address.

Answer 11

[Farah Khleel]

Windows: C:\Program Files\MATLAB\R20***\licenses\network.lic

Linux: /usr/local/MATLAB/R20***/licenses/network.lic

macOS: /Applications/MATLAB_R20***.app/licenses/network.lic

[Walter Roberson]

How does this differ from the information given at https://www.mathworks.com/matlabcentral/answers/95791-why-do-i-receive-license-manager-error-95#answer_105143 ?

Answer 12

[Khanh Nguyên Quôc]

Windows: C:\Program Files\MATLAB\R20***\licenses\network.lic

Linux: /usr/local/MATLAB/R20***/licenses/network.lic

macOS: /Applications/MATLAB_R20***.app/licenses/network.lic