In server 4.11 version, I had ran my WF in new webportal and after entering the input I clicked on the next button , Ideally WF should navigate to second screen.
there might be a chance that you run into a problem we already fixed. What exact server version are you using? (latest is 4.11.2). Is your component part of a loop? (that would support my hypothesis)
If you are already using the latest server version and the problem still persists would it be possible for you to provide a minimal workflow where the problem occurs?
And regarding the second problem: can you maybe provide the respective part of the log output (View > Open KNIME log)?
can you also please make sure that the Server’s Executor is up-to-date? (latest AP 4.2.2)
(here is a guide to update the executor; in particular the ‘KNIME Remote Workflow Editor for Executor’ extensions needs to be the latest version, which is 4.11.0.v202008251349).
The other problem: what Analytics Platform version are you using locally? I think, an update should help here, too.
And your last question: no, there is no need to re-upload the workflows.