SPD2010 Custom activity asembly missing when wep app uses https (http works perfectly)

Hello,
For a while now, we've been working with a custom workflow activity (http://spdwfextensions.codeplex.com/) in our SharePoint system. Today, we changed our web application from http access
to https. The change seemed to go without a hitch, until we checked our workflows and none which use the Custom activity will start (with status Failed to Start). If we opened the workflow in SPD2010, the lines with the custom action were replaced by
lines that read "Could not deserialize object. 'Nivlag.SpdGenericInterfaceActivity' The type could not be resolved.
The problem got weird when, while trying to debug it, we realized that if we used the old http connections the workflow worked perfectly once again (the workflows worked correctly as well as SPD 2010). As soon as we retried the https connection the
same issues reappeared.
We want to move to using SSL with all our WebApps, but right now, this situation is a total show-stopper.
Any helped would be deeply appreciated.
Technology is the curse of the blessed

Hello Carlos,
Please list detailed steps of how you changed web application from http access to https.
Few things to try:
1. Make sure AAM is set correctly for http and https sites.
2. You may need to add root cert of your SSL certificate to Central Admin->Security->Manage Trusts.
This link includes steps to add root cert -
http://blog.brainlitter.com/2010/08/02/resolution-for-sharepoint-designer-2010-data-source-non-specific-error/.
3. Clear client site proxy assembly cache for SPD workflow actions:
Clear the proxy assembly
cache on the machine where SharePoint Designer is installed. Delete all directories and files at %System Drive%\Documents and Settings\%user%\Local Settings\Application Data\Microsoft\WebSiteCache or for Vista %System Drive%\Users\%user%\AppData\Local\Microsoft\WebSiteCache.
If above does not help resolved your issue, you may consider to open a support ticket with Microsoft -
http://support.microsoft.com/default.aspx?id=fh;en-us;offerprophone
However, other members of the community may still have encountered the issue you're seeing, and have a solution to offer!
Regards,
Jing Wang | Microsoft Online Community Support

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SPD2010 Custom activity asembly missing when wep app uses https (http works perfectly)

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