I had this same issue. I upgraded from dnn 6.x to 7.6. I could not go into edit mode, I could not move modules. Every fix I attempted failed. The IIS server was current. I updated my jquery to the latest one which solved the issue of only having one set of controls for all modules but I still could not move modules or get into edit mode.

I went old-school and downloaded a full install version of DNN 7.0.6. I took the web.config file from that package, changed the connection strings and machinekeys and replaced my entire web.config file. Problem solved! I don't know what was wrong with the web.config and I don't have the time to comb through it.

Hi,

My solution is to reinstall the windows system and use the system of "windows server 2008 r2 enterprise".  ago, I use the "windows server 2008" so when I go into edit mode there's 401 error happens.

I managed to fix this, I'll summarize my findings as it may help someone else:

I am on DNN 7.1.1 on Server 2012 IIS 8

I did NOT make this change ( http://www.dnnsoftware.com/wiki/Page/...) - it is still set to False in WebConfg

I have 2 sites with the same MAchineKey - I think this may have confused my cookies. I did a complete delete of all cookies and now it works with Control Panel.

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