We had this issue with an Outsystems Traditional App: When the user clicks on the link that opens a Popup (link with the method 'Navigate', RichWidgets\Popup_Editor ), is getting this error: "Invalid viewstate in postback". The popup opens, but it is blank. The Outsystems infrastructure is On-Prem, with multiple servers.
This seems to be fixed for now, by restarting the OS services and the IIS server. I don't know if the issue was caused by something that was getting hang up and if maybe it will happen again..?
Does anyone had this issue in the past and/or have any thoughts of what could have caused this issue? ...Could it be related to sticky sessions? Thanks
Hi @Marian-Vlad Man
I have also facing same issue in past
may be one of the reason behind that View state Mismatch like server processing the popup request might not have the correct view state data, resulting in an error.
or server cannot locate or validate the view state data caused by server switching in multi-server setups without sticky sessions.
another reason is Session Expiration or Corruption If the user's session expires or becomes corrupted, the server cannot process subsequent requests relying on session data.
Regards,
Rajat