After upgrade spectrum from 10.4.1 to 21.2.8, the Oneclick webapp page from Oneclick browser it again redirects back to oneclick browser page.
The Oneclick webapp page does open.
Release : 21.2
Component : Spectrum OneClick
While launching webapp its throwing exception in webswing log : org.glassfish.cyrus.core.Handshakeexception response code was not 101 : 404
Check the webtomcat server.xml and verify the running on port xxxx (Example 9443)
Then the $WEBTOMCAT/bin/webswing.properties and webswing-admin.properties files and check if the wrong port is used xxxx (Example 8080) instead of correct one (Example 9443).
Correct the port from 8080 to 9443 in these 2 properties files, restarted webtomcat and check it should start working.