Can you launch LMTools and go to the Server Status tab and select Perform Status Enquiry? This should give more information as to what the issue might be.

Actually, it is my license to Envi 5.2 that I am having trouble getting to work but in any case many thanks for your offer to help. Below the information you were asking for. I have also gotten the following message when I tried to start the licence server "VD is starting, please check vendor daemon's status in debug log” and when I go to reread the licence I get "Reread server failed" which I don't know if it is relevant or not to the problem. I also went into the Services (local) and saw that the FlexNet Licensing Service 64 was actually running in Manual mode. Below also the result from Server Diag.

Status
--------
Flexible License Manager status on Tue 11/14/2017 09:21

[Detecting lmgrd processes...]
License server status: 1700@108080199
License file(s) on 108080199: C:\Program Files\Exelis\license\license.dat:

lmgrd is not running: License server machine is down or not responding.
See the system administrator about starting the license server system, or
make sure you're referring to the right host (see LM_LICENSE_FILE).
Hostname: 108080199
License path: 1700@108080199;
FlexNet Licensing error:-96,7. System Error: 11001 "Comm. error"
For further information, refer to the FlexNet Licensing documentation,
available at "www.flexerasoftware.com".

--------
Diagnostics
--------
FlexNet diagnostics on Tue 11/14/2017 09:53

-----------------------------------------------------
License file: C:\Program Files\Exelis\license\license.dat
-----------------------------------------------------
"envi" v5.200, vendor: idl_lmgrd, expiry: 1-jan-0000
License server: 108080199
floating license no expiration date


This license cannot be checked out because:
License server machine is down or not responding.
See the system administrator about starting the license server system, or
make sure you're referring to the right host (see LM_LICENSE_FILE).
Feature: envi
Hostname: 108080199
License path: C:\Program Files\Exelis\license\license.dat;
FlexNet Licensing error:-96,7. System Error: 11001 "Comm. error"
For further information, refer to the FlexNet Licensing documentation,
available at "www.flexerasoftware.com".
-----------------------------------------------------
"envi_cartosat" v5.200, vendor: idl_lmgrd, expiry: 1-jan-0000
License server: 108080199
floating license no expiration date

What is the name of the server in your license.dat file? Here it shows the server name is 108080199. Make sure the server name and server id (mac address) of the system matches that of the license.dat file.
You can change the host name in the license.dat without invalidating the license but you cannot change the server id (mac address) it is tied to. That would require rebuilding the license file.
Also make sure a firewall is not blocking the port.

http://www.harrisgeospati...leID/18888/4097.aspx
http://www.harrisgeospati...ft/4233/Default.aspx

Thanks again for your help. The MAC address may be the whole problem. The MAC address I have found using the IPConfig/all command is very different eg 40-B8-9A-76-8D-61. I have tried entering this combination of letters and numbers but haven gotten any further. I am trying to work on closing the firewall and then trying but AVG has made it very difficult to do now but I am working on it and will let you know how I made out.

It would require that we rebuild the license in that case, which does require that the license be current on maintenance. You should contact your local representative to discuss a license transfer:
http://www.harrisgeospati...mpany/ContactUs.aspx

yesterday I installed with crack ENVI 5.3 but today it does not works... can you help me?
it writes: "The code execution cannot proceed because idl.dll was not found. Reinstalling the program may fix this problem."

You could access the ENVI 5.3.1 download here:
https://www.harrisgeospatial.com/MyAccount/Downloads.aspx