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Okay, So i've seen this discussed a few times, but I've done everything I can think of here.
I'm updating to 2013, I obtained a new 2013 .lic file from autodesk. On my server I replaced the old 2012 .lic that's inside the flexnetserver directory with the new 2013 .lic file. I then quit the lmgrd and adsknlm processes and restarted them but I'm still getting the "A valid license could not be obtained" error when I open maya
Make sure your license manager status shows that Maya licenses are available.