DevForce 2010: Padding error on Azure

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Padding error on Azure

Printed From: IdeaBlade
Category: DevForce
Forum Name: DevForce 2010
Forum Discription: For .NET 4.0
URL: http://www.ideablade.com/forum/forum_posts.asp?TID=2425
Printed Date: 29-Jul-2026 at 12:23pm

Topic: Padding error on Azure

Posted By: GeorgeB
Subject: Padding error on Azure
Date Posted: 07-Jan-2011 at 4:55am

I'm testing my Silverlight app running against SQL Azure using DF 6.0.7 hosted in Windows Azure.

For some reason I'm getting a message saying "Padding is invalid and cannot be removed".

I'm not using any encryption (that I know of) and there is nothing in my web.config that shouldn't be there - connection strings, EdmKeys and that's about it. allowAnonymousLogin="false" and loginManagerRequired='true" as I'm using my own ILoginManager.

I'm currently running two instances in the Staging enviroment.

I've just changed it to run a single instance and I don't get the error message.

Is there something I can do to fix this?

George

Replies:

Posted By: kimj
Date Posted: 07-Jan-2011 at 9:33am

Set the "session encryption key" in the web.config to a non-blank value. When load balancing is used, as with multiple Azure instances, this key must be the same on both instances in order for requests to be load-balanced. The inscrutable error is coming when encrypting/decrypting the SessionBundle passed with each request.

The "key" is really more like a password, and is used to generate an AES hash key.

Posted By: GeorgeB
Date Posted: 07-Jan-2011 at 9:49am

Hi Kim

Thanks for that. I'll give it a go.

George

Posted By: GeorgeB
Date Posted: 10-Jan-2011 at 6:52am

Hi Kim

I took the opportunity to move to another datacenter and I have reconfigured everything from scratch.

However I'm still getting the padding errors even with the changes you suggested.

When I go back to a single instance, everything runs perfectly.

Is there anything I can do?

George

Posted By: kimj
Date Posted: 10-Jan-2011 at 8:32am

I want to check that you didn't copy the <serverSettings> from my post above as is. Those values are the defaults. The only change you should need is to set the sessionEncryptionKey to a non-blank value; when not set or blank DevForce assigns a value for each running instance based on the machine address. So, make sure you've got all your previous serverSettings values, and then set the sessionEncryptionKey.

Other than this setting, I don't know what would cause the error. Are you using ASP.NET security or the aspnetdb directly?

Posted By: GeorgeB
Date Posted: 10-Jan-2011 at 9:29am

Hi Kim

I've taken out anything that isn't needed. Takes 20 minutes to upload to staging so I'll have to wait to test.

I'm not using ASP.NET security or the aspnetdb. All my own stuff.

Okay wait - I'm rereading your original message (slower this time). You say make it none blank? So I can put in anything I want and it should work?

I made it blank as that is what I assumed from your message. My mistake then. The default is blank?

It's getting late so I'll have a go at this in the morning again.

George

Posted By: kimj
Date Posted: 10-Jan-2011 at 1:26pm

Yep, sorry for the confusion. The default is blank, but you want to specify something. I don't have any guidance on what that "something" should be, but think of it as a password so it should be non-trivial.

I should add that support for load balancing is only provided with certain licenses. If your debug log contains a message about not finding a license for "session-agnostic load balancing" it means we're ignoring your server key. If you find this happening, contact your account rep about getting an eval license.

Posted By: GeorgeB
Date Posted: 13-Jan-2011 at 6:39am

Hi Kim

Okay so I have upgrade my license. I used the "Product Key Updater" from the Programs menu to enter the new license key.

I deployed to Azure and I still get the Padding error.

Am I missing a step?

George

Posted By: kimj
Date Posted: 13-Jan-2011 at 10:35am

The Product Key Updater only updates the registry with your new product key. You'll also need to open your VS solution and save your EDMX in order to regenerate the model code. Then re-build and re-deploy to Azure, and hopefully all will be good.

Posted By: GeorgeB
Date Posted: 13-Jan-2011 at 10:04pm

Thanks Kim.

I think I was too excited about having it work I didn't even think about regenerating the model.

How many times have I seen the license inside the generated designer? Hopefully this will help someone else on the forums.

Sorry I should slowed down to a blur. Thanks for the assistance.

George

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