Why do I receive License Manager Error -8?

这个问题通常表明许可file is served from a network license manager and that there is a problem with the license.dat file on the machine running the license manager. The cause of this error may be due to one of the following:

1. The Host ID for which the license.dat file was generated is not the Host ID of the license server machine

2. Missing, corrupt, or incorrect characters in the license.dat file itself

3. The system time and date are not set properly. Check to make sure that the date and time are set correctly on the machine before proceeding below.

This issue may also occur if you are using MATLAB R2007b or below with a standalone license file generated for R2008a or higher.In this case, generating a license file for the correct release of MATLAB will resolve this issue.

If the time and date are set correctly, and you are not using R2007b or below with a standalone license file for R2008a or higher, see the steps below for troubleshooting the license file:

The first step is to locate the license file (license.dat) for the license manager. The license.dat file on the server machine is located in:

$MATLABROOT/etc

Where are the license files for MATLAB located?

//www.tatmou.com/matlabcentral/answers/99147-where-are-the-license-files-for-matlab-located

(where $MATLAB is the MATLAB installation directory)

Please check for the following:

1) Make sure that the Host ID specified in the license file matches the Host ID on the "SERVER" line of the license file. Also if the Host ID is not proceeded by "ID=", it must match the Host ID of the license server. For more information on obtaining your Host ID, see the related solution listed below.

The Host ID of the license file will be in a comment line in the license file. For example:

                        #BEGIN------cut here------CUT HERE-----BEGIN
                       
                        #MATLABlicense passcode file.
                       
                        #LicenseNo: 123456 HostID: 001122334455

In this example, the Host ID is the MAC address 001122334455. This same MAC address should be in the SERVER line of the license file. For example:

SERVERmy-license-host 001122334455 27000

如果错误的主机ID用于服务器,or if the license file was generated for a different Host ID, this error will occur. Individual licenses use a Host ID that is ID= and the license number. If you have an individual license, this should be the Host ID in the SERVER line. For example:

SERVERmy-license-host ID=123465 27000

NOTE: Changing the Host ID listed in the commented section of the license file will not resolve the error. If your Host ID is incorrect, you will need to obtain a new license file generated for the correct Host ID.

2) This error may be the result of having extra carriage returns in your license file. In order to avoid this, ensure that the following strings all begin on a left justified line: #, SERVER, DAEMON, or INCREMENT. Sometimes an INCREMENT line can get wrapped on the end of the preceding INCREMENT line causing it to be omitted.

3) If you are located in Turkey, or the default language of your computer is Turkish, please refer to the article below:

Why do I see license manager error -8 when launching MATLAB on Linux when my locale is set to Turkey?

//www.tatmou.com/matlabcentral/answers/357580-why-do-i-see-license-manager-error-8-when-launching-matlab-on-linux-when-my-locale-is-set-to-turkey

3 Comments

Walter Roberson on 29 Jul 2016

In the case of individual licenses, the last few versions of MATLAB have been easy to install: download the installer, start it running, indicate your agreement with the licenses in the appropriate place, provide your Mathworks login credentials, select which of the products you want to install, indicate where you want to install them, set it executing. Eventually, indicate which user it is authorized for, and request activation.

If you are using a license server for a commercial or academic license, then Yes, matters get more complicated. Unfortunately, license servers do tend to be complicated. The other major vendors of similar software all use the same licensing technology so the situation is the same for them.

Yeman Brhane on 16 Feb 2017

Most of the time this error happens when the folders listed in the readme files are not properly copied to the %installdir% to overwriting the originally installed files. So make sure you replace them prperly.

songyao dou on 16 Nov 2019

sorry, i tried this way,but stil failed,can you give me another way.

Walter Roberson on 27 Jun 2016

It takes a lot of resources to produce a video that would cover all of the possibilities on all of the operating systems. You would be better off contacting Mathworks Support for free installation assistance.

VAIBHAV BHARDWAJ on 4 Jul 2016

ya ,but still i am not able to fix this error

Walter Roberson on 4 Jul 2016

Was Mathworks Support unable to assist you with your installation problem?

I estimate that it would take me about a month or two months of full time effort to create a suitable video, as I would have to research all of the possibilities, load all of the different operating systems, figure out how all of those operating systems worked, research all the various ways things could go wrong. Make that three months full time work, perhaps four. Plus the time to learn video editing, and the cost of buying the various operating systems to experiment with. I am sure I would have learned a lot by the end, but keep in mind that during that time I would not be answering Questions here because I would be busy working on the video to answer one Question. A Question that Mathworks Support might already know the answer to for any particular operating system and release.

4 Comments

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Anesu Chimhowa on 6 Jul 2018

you guys are not serious just installing an application just as as dicficult as rocket science..would you have used smartphones if it was this complicated..u litteraly did nothing to hide the complexity of this thing

Walter Roberson on 6 Jul 2018

This error condition only applies when a license server is being used. Unfortunately it turns out that license servers are surprisingly complex.

Mathworks uses Flexera's flexlm license server, which is the same license server used by many many software packages, including all of the major competitors to Mathworks that I could think of to check into.

Walter Roberson on 29 Oct 2018

It has since come to my attention that another case in which this problem shows up is in connection to some cracked versions of MATLAB. We delete all information about how to crack MATLAB.

2 Comments

Walter Roberson on 1 Mar 2018

That would happen if you installed the network license daemon (flexlm), but that the MAC address you requested the license file be generated for is not recognized as one of the MAC addresses of the license server.

This could happen due to a mistake in which system the license was requested for. It could also happen in some Linux environments due to changes in the ethernet device naming conventions. It can also happen in some OS-X or MacOS environments that have dual thunderbolt displays installed. It can also happen in some Linux systems that have no hardwared ethernet ports (only WiFi) and the system has been configured to randomize the WiFi MAC address on every boot.

Zarwish Javaid 1 minute ago

How to match the Host ID and Host ID for Server Machine for windows 10

1 Comment

Walter Roberson on 12 Mar 2020

Notice the license_server.lic file. That file should contain a SERVER line that indicates which computer is your network license server. That license server needs to have its license repaired (or possibly you are not pointing to the correct license server)

Walter Roberson on 22 Mar 2020

error -8: corrupt license file, or license server hostid not same as license file //www.tatmou.com/matlabcentral/answers/100496-why-do-i-receive-license-manager-error-8 ; or flexnet bug for redundant servers //www.tatmou.com/matlabcentral/answers/103212-why-am-i-getting-a-license-manager-error-8-when-running-redundant-servers ; or bug that affected locale Turkey //www.tatmou.com/matlabcentral/answers/357580-why-do-i-see-license-manager-error-8-when-launching-matlab-on-linux-when-my-locale-is-set-to-turkey ; or attempt to use cracked license

Those are all of the license manager error -8 cases that I have been able to track down. The first three of those deal exclusively with problems on a license server. When you are using a license server, you do not do Activation, you just point yourself to the license server. The license server itself would be installed using other tools that are not Activation.

Other than the case of attempting to use a cracked license, there is one case where Activation applies, and that is the case where you have Activated a local copy, but you also have your license path pointing to a license server, and your local license might be okay but the problem could then arise when your local version tried to talk to the license server. A locally-licensed MATLAB would try to talk to a configured license server if you attempted to use a function from a toolbox which you do not have locally licensed, in which case the local license would want to reach out to the license server to see if a license for the toolbox was available there. This situation would require repairing the license file on the license server, or (sometimes) pointing yourself to a different license server (it has been known to happen that a new license server is created but the old one is not completely turned off and ends up sitting around with invalid licenses.)

Walter Roberson on 14 Apr 2020

Chances are that you receive it for one the same reasons described above. If not then you will need to contact Mathworks Support for free installation assistance.

Walter Roberson on 28 Apr 2020

我已经找到了三种可能的原因problem on MATLAB installations. All three of them are problems with remote license servers, and require that the license server administrator make changes. If you are someone who does not know much about computers, then you are not the license server administrator, so you should ask your license server adminstrator to repair the problem.

The one case that I tracked down that involves something on the user's machine, involves cases where the user is using a cracked version of MATLAB. People who are running cracked versions of MATLAB should purchase MATLAB.

Steven Lord on 2 Sep 2020

If you are experiencing difficulty with the installation process, either problems with the instructions in the Installer not working as expected or problems with the instructions in the install process documentation , please contact Technical Support using the telephone icon in the upper-right corner of this page for installation assistance.

Walter Roberson on 23 Aug 2020

Activation keys only apply to individual licenses. Error 8 only applies to licence servers for network licenses, with the exception that Error 8 can show up for some attempts to use cracked licenses.

Walter Roberson 1 minute ago

有三种方法:“加密代码虱子nse file is inconsistent" can happen:

An invalid license key was entered in the network license file on the license server
The license file on the license server is corrupted, including cases where extra newlines were accidentally introduced during copying and pasting
An attempt is being made to use a cracked version of MATLAB.

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