After migration on last release v5.3-b9342 on a linux server , you have may trouble to connect on URL : http:/<your zoom server>:8873/vab/
The following error is displayed:
You will need to clear the browser cache manually. In Firefox, use the History > Clear Recent History option to do this. Similarly, in Chrome, use the Clear Browsing Data option, in Safari use the History -> Clear History and Website Data option, and in Internet Explorer 9 and above use the Tools (Gear Icon) -> Safety -> Delete Browsing History.