@Joshi
Do you get "503 - Service not available" only with cops (http://<ip-raspberry-pi>/cops) or also with other webites on your Raspberry Pi (http://<ip-raspberry-pi>)?
If not, you could try http://<ip-raspberry-pi>/cops/checkconfig.php
Have you restarted your webserver and/or your Raspberry Pi?
Run "apt-get update && apt-get upgrade" again.
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