If I put a checkbox (or any standard control) on a blank aspx page, and a button to postback, the value of the control is saved. This is pretty standard viewstate stuff. If I do exactly the same, but into a custom abstract (otherwise blank) webpart, the button posts back, bu...

Help me, i move up, move down node order in admin to error logout.

Hello. According to stack-trace and errors you are receiving, I would focus on ASP.NET public articles, as these errors seems to be .NET/environment related. As for “An existing connection was forcibly closed by the remote host” error, I found many articles and forum thr...

Hello, Thank you for the additional information. If I try to click this testing button then the same error occurs, as if I click the Allow cookies consent button. Thus I think, that this issue isn't caused by the web part itself, but by some other part of the site. Could yo...

hello when return from a blank shooping cart to home page ( for first time ) in 1.9c we have a error about post back or call back invalid : Invalid postback or callback argument. Event validation is enabled using in configuration or in a page. For security purposes, this...

How to solve the 'Element' is an invalid XmlNodeType error

Two interesting web parts by Interesting Pty Ltd

Error message: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Hi Radek, This happen only on client / external user machine, I'm unable to reproduce the problem but now it seem to happen very often, I Upgraded to 5.5 R2 some time ago, here's the build number v5.5.4027 R2. Now I get 'Invalid web resource request', 'Invalid View...

[Problem picture](https://i.stack.imgur.com/0Sec0.png) I use Visual Studio 2019 to run. I don't know how to add domain name in web.config.