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I recently moved the license server to a different computer. I have no problem getting the license from other client workstations. However, I cannot run Inventor from the computer that is running the license server. I get the following error "Valid license could not be obtained by the network license manager" Error [-15.570]. We were previously running the license server and application from the same computer.
If your OS is Vista or Windows 7 and using IPv6 then this is likely the issue. You need to make a hosts file change so that your localhost is pointing to an IPv4 like 127.0.0.1 instead of :1.