Hi,

 

You can goto the administration page , the Functionalities tab , and change the 'Network Error Timeout'

 

But I think your issue is caused by the ASP.NET thread be blocked , and that force the server get 503 error.

 

Can you try to setup the most simple website , which only contains the LiveSupport , and then try again ?

 

To fix your issue , we must find the reason out.

 

Regards,

Terry