CUCM Commands

 

HTTP Status 404 – /ccmadmin/showHome.do

Login in to the CUCM system and make sure all the essential services are running by CLI.
Admin:  utils service list page

Try to restart Cisco Tomcat service by following command. Usually, that fixed the above issue.
Admin:  utils service start Cisco Tomcat

 

 #jabber

So, finally I found a SOLUTION by myself. This error is not server based but purely client app based. If we refresh the app by removing its temp files from windows or clearing the data and cache from Android/iPhone, we should be good to go. 
C:\Users\%USERNAME%\AppData\Roaming\Cisco

C:\Users\%USERNAME%\AppData\local\Cisco

Google Chrome Download Link

 https://www.google.com/intl/en/chrome/?standalone=1

Error CredSSP encryption oracle remediation

Win+R> run > gpedit.msc > Computer Configuration > Administrative Templates > System > Credentials Delegation > Encryption Oracle Remediation>

Now set it to Enabled, and set the protection level to Vulnerable as in the below image, and click on the OK button.

Enable Group Policy Editor via the Command Prompt (Windows Home)

Start Menu > cmd > Run as administrator and paste below lines together: 


FOR %F IN ("%SystemRoot%\servicing\Packages\Microsoft-Windows-GroupPolicy-ClientTools-Package~*.mum") DO (
DISM /Online /NoRestart /Add-Package:"%F"
)
FOR %F IN ("%SystemRoot%\servicing\Packages\Microsoft-Windows-GroupPolicy-ClientExtensions-Package~*.mum") DO (
DISM /Online /NoRestart /Add-Package:"%F"
)

Wait for 100% then try again.