Slow response times and Timer_MinBytesPerSecond in HTTP.SYS logs

Slowness in web applications might be result of a wide range of underlying issues in the application code, client side, network or web server. Therefore, system administrators should analyze IIS logs, Failed Request Tracing logs, dump files, and HTTP.SYS logs to narrow down the issue.

Web page with an iframe to a PowerApps URL keeps spinning

If a web browser starts loading the web page but it never finishes loading it, look for the resources being loaded and the debug errors in F12 Developer Tools.

If the page has an iframe, try testing the page after removing the iframe. If it works without the iframe, then look for further leads to narrow the issue down.

Changes to the SameSite Cookie in KB4534271 and other updates

SameSite cookie prevents cross-site request forgery (CSRF) attacks by restricting the usage of third-party resources in web applications. Resource examples are the URLs in GET, POST, link, iframe, Ajax, image etc. If a URL is different than the actual web application’s URL, it means that it’s a third-party resource.