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Inquiry about UCWA Warning

Retired product. Microsoft retired Skype for Business Online on July 31, 2021, and support for Skype for Business Server 2015 and 2019 ended on October 14, 2025. Microsoft Teams replaces them. This article is kept for reference. Skype for Business Online retirement
Written June 2020. Microsoft changes these admin screens often, so the screenshots below may not match what you see today. The sequence of steps is usually still correct — if something looks wrong, tell us and we'll update it.

Time to Execute: 15m

Warrning is regarding: "Source: ASP.NET 4.0.30319.0"
Event message: An unhandled exception has occurred.
Exception message: A potentially dangerous Request.Path value was detected from the client (:)
The reason of this warning is some thing odd in the URL for the system..

These are related to UCWA ( Unified Communication Web API) that exposes Skype for Business Server 2015 Instant Messaging and Presence capabilities. It enables developers to make their Enterprise applications and intranets more lively and connected to business contacts.

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