We are using azure alias URL "https://abc.com/sitecore/login" to access our prod CM site "https://abc-1001-cm.azurewebsites.net/sitecore/login".
- Earlier we had Sitecore 9.0.1 without identity server and redirection was working fine.
- After upgrading to Sitecore 9.3 the azure alias URL is redirecting to identity server URL which shows the Sitecore login screen.
- Post login, it is redirecting to Sitecore website "https://abc-1001-cm.azurewebsites.net/" instead of Sitecore launch pad.
This issue happens intermittently even while using the CM app service URL to login Sitecore("https://abc-1001-cm.azurewebsites.net/sitecore/login")
Basic information about application: Sitecore Version 9.3 (XP scaled) running on Azure PaaS with Application Gateway and CNAMES(alias URLs/DNS names) enabled.
Requesting a solution for the above issue.