Accroding to the log file, it seems like the client cannot communicate to the MP to get DP location, so that it cannot download the files from DP.
We could verify the health of MP first, check if the client can access the following 2 URLs:
https://<MPServerFQDN>/sms_mp/.sms_aut?mplist
https://<MPServerFQDN>/sms_mp/.sms_aut?mpcert
If it gets any error browsing the above mentioned URL, we could check the MP logs like mpcontrol.log to locate to errors.
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