这个问题跟很多人遇到的一样，VM下载，一开始使用正常，特然某个时候，就挂了，直接引用老外的描述吧
http://community.dynamics.com/ax/f/33/p/203984/529631
When trying to access the Ax I get the following error:
There is a problem with the server
Sorry, the server has encountered an error. It is either not available or it can't respond at this time. Please contact your system administrator.
500 Error
I have done the following:
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Made sure I have internet connection. (The fact that I am able to provision the user means I have internet connection)
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By passed the proxy and firewall
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Ensured the Ax service is running
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Change the VM's date and time zone to be the same as the host.
试验很多办法，BING，Google一圈，还是上述链接有网友给出答案。
Have you tried changing the AX7 VM time zone to same as host PC/server time zone?. And make sure the time displayed on the AX7 VM is the correct time. It work like a charm for me.
验证virtulbox 5.0.12有问题，时间同步，只改了时间，时区没有修改，AX的激活服务有问题（猜测）
老老实实，也去修改时区，重新修改时间，问题解决。
