CA PPM: Unable to log into PPM. error network

Document ID : KB000109047
Last Modified Date : 30/08/2018
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Unable to log into PPM. In the login page users get an error:
[EN ] 
[en - error network]

Why are we getting that error?
This was caused by an internal network issue not allowing some websites to function properly.  CA PPM was impacted by the network issue.