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WPF ASP.NET app not authenticating against SharePoint SITE.

Nemanja SOVIC 116 Reputation points
2020-07-03T02:32:49.447+00:00

Hello,

We have a custom MVVM WPF application that is working against clients SharePoint API. This application has been working for months/years. Lately, first in UAT and then in Production the app could not authenticate, throwing this error:

The request was aborted: Could not create SSL/TLS secure channel

We have no access to their server, but I need to know why this could be happening(I need to help them solve this) - the application is working IF they are using it within their network. We can authenticate to the site when using browser.

Thank you.

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  1. Leon Laude 85,701 Reputation points
    2020-07-03T11:34:01.027+00:00

    Hi,

    You may also want to ask the SharePoint experts in the dedicated SharePoint forum over here:
    https://social.technet.microsoft.com/Forums/sharepoint/en-US/home?category=sharepoint

    Best regards,
    Leon

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