Frequently asked question

How does ArcGIS Administrator discover or find the license server?

Last Published: April 25, 2020


ArcGIS Administrator first checks the 'hosts' file located in: C:\Windows\System32\drivers\etc\ for any entries that designate the IP for the License Manager. If there are none for the License Manager name, it checks the DNS for an entry. If that fails, ArcGIS Administrator puts out a broadcast message looking for the License Manager on the subnet.
There is a time limit in which ArcGIS Administrator must receive a response from the License Manager or it determines that none are available.

This is why Esri recommends that customers 'lock' the License Manager to specific ports in the service.txt file. For License Manager 2018.1 the location for this file is:

C:\Program Files (x86)\ArcGIS\LicenseManager\bin
The port added on the second line of the service.txt file should be in the range of 27000-27009. It cannot be the same as the port in the first line.

SERVER this_host ANY 27000
VENDOR ARCGIS port=27001
FEATURE ACT ARCGIS 1 permanent 1 vendor_info=7KNJDRHFHBK4CFDMJ214 SIGN="052E ABFC 32DD \
               2473 DEFD E276 4BF3 E0DB 87EB 2203 5A30 C014 19A1 C35E 2154 \
               08B1 9460 A2B9 6701 DC4D CAF2 E2FE 1347 0E36 90FA 4F3B E864 \
               BEC8 D3A2 A615"
Do not change any other lines in this file.

Article ID:000020384

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