I found a solution for the people that reinstalling and renaming the files did not work.

1: Pull up run and type in services.msc

2: Ckick on the standard tab at the bottom.

3: Find FLEXnet licensing service.

4: Right click on it and press propoties.

5: Make the start-up type Automatic.

6: Under “service Status”, press start.

Your 3ds max should now work fine. The way I have found this out was when I used to use 3ds max 9 32-bit, the licensing service sometimes became disabled so I had to change it like that. From previous comments talking about FLEXnet, i saw that in services.msc and fixed it.

Hope this helps!  Chris

I got this message about “error 20 licensing server connection ...” on three machines in our lab.

All the machines were identical domain login machines with an install of max and a identical OS image which was put on three days before.

I reinstalled the image (including max) on two of them with no change.

After swapping a hard drive with the machine next to it that was working, I found out the problem was with the hardware.

I checked the rate of the network cards which were identical and benchmarked the machines performance which were nearly identical.

The problem turns out was that the system clock was not set on the non working machines.

Reset the system clock in the bios, and presto working machines.

Hope this helps someone.

I have reinstalled and i did the services stuff, still not working :/

Hi

I got this issue and I solved this by deleting the files inside (C:\ProgramData\FLEXnet).

If you are using another windows version than W7 then try to find this folder into C:\users ... or look for it into common windows folders a search can help too (FLEXnet)

I hope this will help.

I’m having the same thing, but Error 41. I’ve tried everything listed on this thread, any ideas?

Hello to everyone in this community!

I installed the Education Suite for Entertainment Creation 2011 as stand-alone license with serial and key under Windows 7/64bit (completely new) and I’m getting the error 20 too. I tried every solution in this thread - nothing worked for me. Does anybody know a different way to solve this problem? Thank you for your time!

Consider posting on the Autodesk Installation and Licensing forum. Those forums are monitored by Autodesk support staff (unlike these Area forums which are peer-to-peer only).

Max 4.2 through 2014, Composite 2014.
XP-64 (SP2).
nVidia 9800GTX+ (512MB) (Driver 314.22).
i5-3570K @ 4.4GHz, 8Gb Ram, DX9.0c.

I got the same error and I found this on this site http://images.autodesk.com/adsk/files/3ds_max_readme.htm

(Windows Vista and Mac® Boot Camp® operating systems only) A valid license cannot be obtained by the network client when the client and server are on the same machine (IPv4).

Workaround: To workaround this issue, do the following:

Obtain the IP address of the machine. (You can obtain it using the ipconfig command or with the the “System setting” of LMTOOLS.)

Open the hosts file which is located on C:\Windows\System32\drivers\etc folder.

Add the IP address and hostname to the hosts file, such as “10.148.220.50 ACRDLICENSEQA1”

Save the hosts file.

You can now obtain a valid license.

It worked fine for me, you just have to add a line to the hosts file with you info on ip adress *ipv4* and hostname of your computer. My machine was the host of the Network license and I also use max on the same computer, so I need to do that, hope it will help

I have the same problem but with Maya 2011 64bit standalone. I have tried everything on this forum with no success. Initially I was getting error 20, now I am getting error 41. Maya quit working after I upgraded my motherboard. Any other thoughts or solutions to this problem?

To all those who are getting “error 41” you have to make sure “ProductInformation.pit” exists in “C:\ProgramData\Autodesk\AdLM” or “C:\Documents and Settings\All Users\Autodesk\AdLM\”

This is the solution that worked for me.