Snow License Manager 25.1 update fails due to invalid SameSite attribute in web.config

Title

When updating Snow License Manager (SLM) to version 25.1.0 using the Snow Update Service (SUS), the update may fail with a validation error and be rolled back. The update log may contain an error similar to the following:

ERROR SnowSoftware.Update.ProductUpdate [(null)] - Could not install update v 25.1.00 for Snow License Manager Enterprise Edition (UR# 589).

System.ApplicationException: Update could not be installed. Instructions have been rolled back.

---> System.Xml.Schema.XmlSchemaValidationException: The 'sameSite' attribute is not allowed.

This issue occurs when the sameSite attribute is present in the <httpCookies> element in the Snow License Manager web application’s web.config file. During the update process, the XML schema validation does not recognize the sameSite attribute, which causes the update to fail and roll back.

Solution

Remove the sameSite attribute from the <httpCookies> element in the web.config file. The corrected configuration should appear as follows:

<httpCookies httpOnlyCookies="true" requireSSL="false" />

IMPORTANT: Back up the web.config file before making any changes.

File location:
C:\Program Files\Snow Software\Snow License Manager\Web\web.config

Steps

Navigate to the directory listed above.
Open web.config in a text editor with administrative privileges.
Locate the <httpCookies> element.
Remove the sameSite attribute.
Save the file.
Retry the update using the Snow Update Service.

NOTE: This issue is related to web application security settings and may vary depending on IIS configuration and infrastructure. If you are unsure about modifying the configuration file, contact Snow Support for assistance.

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Product

Snow License Manager

Version

9.x

Related Products

Snow License Manager;Snow Update Service

Deployment type

On-premises;Service Provider Edition (SPE)

Visibility

Guest

URL Name

Snow-License-Manager-25-1-Update-Failure-Due-to-SameSite-Attribute-in-Web-config

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Case id: 00001065