MEM clients go offline after Altiris / Symantec Management Agent get uninstalled

Question

MEM clients go offline after Altiris / Symantec Management Agent get uninstalled
Uninstall Symantec Management Agent, refresh client in Microsoft Endpoint Configuration Manager console and the client immediately goes offline.

Client re-install error
Unable to find any Certificate based on Certificate Issuers
Failed to get client certificate for transportation. Error 0x87d00215

GetDirectoryList failed with a non-recoverable failure, 0x87d00454 )
Failed to get directory list from 'HTTPS://site server name/CCM_Client'. Error 0x87d00454
Failed to correctly receive a WEBDAV HTTPS request.. (StatusCode at WinHttpQueryHeaders: 0) and StatusText: '' )
Failed to check url HTTPS://site server name/CCM_Client/ccmsetup.cab. Error 0x80004005
Accessing the URL 'HTTPS://site server name/CCM_Client/ccmsetup.cab' failed with 80004005
Checking the URL 'HTTPS://site server name/CCM_Client/ccmsetup.cab'
IsSslClientAuthEnabled - Determining provisioning mode state failed with 80070002. Defaulting to state of 63.
MapNLMCostDataToCCMCost() returning Cost 0x1 )
Failed to connect to machine policy namespace. 0x8004100e
Client is on internet
Client is set to use webproxy if available.
IsSslClientAuthEnabled - Determining provisioning mode state failed with 80070002. Defaulting to state of 63.

Site server properties are set
HTTPS only
Use PKI cert box checked
Root CA specified.

Answer 1

Resolved. Uninstall of Symantec Management Agent removed most of the Trusted Certs. Used GPO to import certs back.