App suddenly offline

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My free application suddenly went offline last week, and I keep getting an error when I try to re-publish it. I did not make any changes for more than a month, and the application works as it should when running locally. The application has worked fine for about a year. Any ideas what may cause this?   The message shown in Studio Pro says "Error while deploying application". The logs show the following two lines marked as critical: 12:42:52 PMruntime-container/crqz8CRITICALRuntimeWatchdog: watchdog encounter exception - [Errno 111] Connection refused 12:42:52 PMruntime-container/crqz8CRITICALRuntimeWatchdog: terminating container, goodbye: A few tries ago, I also saw warning lines in the logs that mentioned something about an expired license, but I have been using the free version, that should not expire. Also, I can no longer find the buttons on the portal's  Environments page that can be used to upgrade the app, so there is also no way for me to try if upgrading may be a solution.
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3 answers
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Recently sandbox was down, so please check again whether issue is with mendix or is it something related to your application only. 

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Our whole department at Siemens has been down with the same error.  

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I have found a workaround (for now) by downloading a backup, then using pgAdmin to create a local postgresql database, migrating this into the built-in database of a copy of the other app, creating a data snapshot from this, and then finally publishing this new app.

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