Cannot login to Commerce Manager after deploy to new server

Hi!

I just deployed our Commerce site including the Manager to a new server but now I can't login to the manager, I get an infinite loop:

/Apps/Shell/Pages/Login.aspx?ReturnUrl=%2FApps%2FShell%2FPages%2FLogin.aspx%3FReturnUrl%3D%252FApps%252FShell%252FPages%252FLogin.aspx%253FReturnUrl%253D%25252FApps%25252FShell%25252FPages%25252FLogin.aspx%25253FReturnUrl%25253D%2525252FApps%2525252FShell%2525252FPages%2525252FLogin.aspx%2525253FReturnUrl%2525253D%252525252FApps%252525252FShell%252525252FPages%252525252FLogin.aspx%252525253FReturnUrl%252525253D%25252525252FApps%25252525252FShell%25252525252FPages%25252525252FLogin.aspx%25252525253FReturnUrl%25252525253D%2525252525252FApps%2525252525252FShell%2525252525252FPages%2525252525252FLogin.aspx%2525252525253FReturnUrl%2525252525253D%252525252525252FApps%252525252525252FShell%252525252525252FPages%252525252525252FLogin.aspx%252525252525253FReturnUrl%252525252525253D%25252525252525252FApps%25252525252525252FShell%25252525252525252FPages%25252525252525252FLogin.aspx%25252525252525253FReturnUrl%25252525252525253D%2525252525252525252FApps%2525252525252525252FShell%2525252525252525252FPages%2525252525252525252FLogin.aspx%2525252525252525253FReturnUrl%2525252525252525253D%252525252525252525252FApps%252525252525252525252FShell%252525252525252525252FPages%252525252525252525252FLogin.aspx%252525252525252525253FReturnUrl%252525252525252525253D%25252525252525252525252FApps%25252525252525252525252FShell%25252525252525252525252FPages%25252525252525252525252FLogin.aspx%25252525252525252525253FReturnUrl%25252525252525252525253D%2525252525252525252525252FApps%2525252525252525252525252FShell%2525252525252525252525252FPages%2525252525252525252525252FLogin.aspx%2525252525252525252525253FReturnUrl%2525252525252525252525253D%252525252525252525252525252FApps%252525252525252525252525252FShell%252525252525252525252525252FPages%252525252525252525252525252FLogin.aspx%252525252525252525252525253FReturnUrl%252525252525252525252525253D%25252525252525252525252525252FApps%25252525252525252525252525252FShell%25252525252525252525252525252FPages%25252525252525252525252525252FLogin.aspx%25252525252525252525252525253FReturnUrl%25252525252525252525252525253D%2525252525252525252525252525252F

Any ideas why this is? It works just fine on my machine and on the production and UAT server but not on our DEV server?

Thanks!

/Kristoffer