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Configure ArcGIS Web Adaptor memory cache options

When an authenticated user accesses an ArcGIS Server resource and web-tier authentication has been enabled using ArcGIS Web Adaptor (IIS), the Web Adaptor retrieves the user's role membership list from Active Directory. Repeated calls to Active Directory to obtain a user's role list negatively impacts performance of both Active Directory and ArcGIS Server. To optimize performance, the Web Adaptor caches the list of roles that a user is a member of.

In an out-of-the-box installation of ArcGIS Web Adaptor (IIS), a user's roles are cached either in a cookie managed by the web browser or in the primary system memory (RAM) of the web server hosting the Web Adaptor. If the size of a user's role list is less than 4KB, the list is stored as a cookie by the web browser. If the list is 4KB or larger, it is managed in the system memory.

If a user's role list is stored in the web browser cookie cache, it expires in one minute. The ArcGIS Web Adaptor (IIS) system memory cache for a user's role list is configurable and its properties are managed in the RoleCache element defined in the C:\inetpub\wwwroot\{Web Adaptor name}\WebAdaptor.config file. The following section describes the RoleCache element and its properties.





This property limits the number of users that can have their role membership list stored in the system memory.


This property defines the amount of time, in minutes, that a user's list is stored in the system memory. The maximum recommended value for this property is one day (or 1,440 minutes).


This property is used to disable the system memory cache. Disabling the system cache is not recommended.


If this property is set to true, the cookie cache is disabled and only the system memory is used to cache the role membership list for all users.