Hi @Ahmed MS ,
I've seen this error before, it was related to the metered connection that was enabled in the network card settings. Check if this option is enabled, disable it and check again the CcmMessaging.log and ClientIDManagerStartup.log files.
If the issue persists, uninstall the client and install it again without "/AllowMetered" option.
Regards,
Youssef Saad | Blog: https://youssef-saad.blogspot.com
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