Download of the server logs fails with the error, Internal Server error 500

Summary

Trying to download logs from the N2W console may fail with Internal Server error 500:

In addition, when restarting the N2W server, Apache might not start.

This could also cause the error message:  Critical Error - Watchdog Killed DR process after not responding for more than 1800 seconds

Description

Trying to download logs from the N2W console may fail with Internal Server error 500.
In addition, when restarting the N2W server, Apache might not start.
This could also cause the error message:  
Critical Error - Watchdog Killed DR process after not responding for more than 1800 seconds

The issue is caused by file permissions on the log directory, which you can correct as follows:

1. Connect to the N2W instance over SSH as user “cpmuser” and your private key. 

2. Run the following command: 
   sudo chown -R  www-data:www-data /var/log/cpm

Confirmation Steps

After running the command, the log download should be successful.