Invalid Confidential Channel error while opening/refreshing reports/Idle time

Hi All,
We are on 4.3 SP4 Patch11 and after upgrading to this version, we are seeing “Invalid Confidential Channel” error while trying to open/refresh report or after some idle time(even less than 20 mins).
We are working with SAP support and even sent the End to end trace, etc.. and waiting for a reply. Did anyone experience this issue and if you can provide any suggestions?

Thanks,
Srinivas