Hi,
I think you have an high availability setup.
Can you share more on this.
And upload dev_disp, dev_ms and dev_w0 log files
Also share OS DB and other setup details
and yes, your kernel level, as an update can resolve it.
Try to disable firewall - and try again.
Refer-1950465 - Request handling without progress
1896188 - Yellow ABAP instance: Request handling without progress
Divyanshu