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Citrix Storefront 3.9 passthrough authentication issues

Situation:

After a customer recently upgraded to Storefront 3.9 some users complained of having to authenticate twice when using various browsers. Once in Storefront and once again in a Windows Login prompt when they launch their selected application.

This seems to be related to the way Storefront runs the receiver detection, if a compatible receiver is detected the users are prompted and asked if they want to ‘Log On’ with their local computer credentials. (see screenshot from Workaround 1 below).

Previously we have only ever used ‘username and password’ authentication, but this process seems to negate / bypass the authentication configured in Storefront.

Workaround #1:

The users should be prompted each time to ‘passthrough’ their windows local windows credentials by clicking ‘Log On’.

The users can skip the passthrough and simply click ‘switch to user name and password’

To use the account you used to sign on the computer, click Log On.

Workaround #2

If you have more than one Store in Storefront separate the authentication methods in Storefront so they are not shared between the stores (as pass through detection continued to happen regardless of the authentication method selected when shared between stores)

(note the storename has been obscured for customer anonymity)

Resolution:

In relation to the references section for setting up a good receiver configuration this customer had broken the majority of the rules for good reason. So there was no adhering to the Citrix best practises, so workaround 2 became their resolution based on other requirements (like not all users are domain joined, not all devices that connect are manager by the customer, rather 3rd parties to which they have no control, the users have no / little access locally to upgrade or install or modify receiver configurations – the list goes on)

Post the upgrade the Authentication method between two different stores were merged, and shared authentication was enabled. Regardless of the settings we were selecting / applying in the Browser, the pass through continued to haunt users and attempt to log them in with their local credentials.

Once we split the authentication, so it could be controlled separately between the two stores, the issues went away and we had more granular control.

There were are number of things the customer was not doing like configuring the receiver clients locally, and configuring the local receivers to support http:// as they have a large number of non domain joined users and this prevented a ‘one size fits all’ approach to deploying receiver and Storefront internally. Our final suggestion was to look to replace this entirely with NetScaler and HTML5 instead.

References

https://docs.citrix.com/en-us/receiver/windows/4-7/secure-connections/receiver-windows-configure-passthrough.html