503 Server Unavailable on brand new HC2 4.056

[vsokolov 6]

On brand new HC2 4.056 i have got "503 Server Unavailable" page on first boot.
I tried many different solutions:
- reboot by power button;
- reboot by detach power plug;
- restore to factory default state from the recovery mode;
- change the browser (Firefox, Safari);
and all combination of this one.

I was found this 

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 and was very upset - looks like only need to replace the device.
But I found that the API (http://HC2_IP/docs) is fully functional. For example, GET /settings/info and other methods.
So the base system works fine. Thus, the chances of a solution to the problem is.
After several hours of search (thanks to Google) and meditation - a solution was found:
1. Authorize in system (we remember that you need to use default account "admin" with password "admin") via the API (http://HC2_IP/docs) by calling any method of the API, which requires authorization. For example, by pressing "TRY IT" on method GET /settings/network. 
Do not close the browser window!!!
2. After the successful authorization (we saw proper network info) IN THE SAME BROWSER WINDOW AS IN STEP 1 enter in browser's adress line: http://HC2_IP/services/startUpgrade.php 
3. IN THE SAME BROWSER WINDOW AS IN STEP 1 and 2 enter in browser's adress line: http://HC2_IP
4. You should see the process of updating the system. Upon its completion and restarting the system, the error "503 Server Unavailable" no longer appears.

Edited January 30, 2017 by vsokolov

[T.Konopka 8]

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[raetz 0]

Thank you, I had exactly the same problem with a new device and this solution saved my weekend!

Edited March 3, 2017 by raetz