Symantec Endpoint Protection shows every client 'offline'

Dear all.,
a.)we used Symantec to protect our PC. and always I checked PC status on management endpoint.
and one day i find every one shows "offline",but actually i'm sure they are active.
how to deal it?
b.)i think C driver is full.but how can i clean it?
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Pu YuAsked:
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Shaun VermaakTechnical Specialist IVCommented:
You sure clients can access the server? Is server firewall allowing connections?
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Pu YuAuthor Commented:
Yes ,
Because about 2 weeks ago , I also received the e-mail, shows online....
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Shaun VermaakTechnical Specialist IVCommented:
To get info on used space, use WinDirStat as SYSTEM
https://www.experts-exchange.com/articles/30792/How-to-run-commands-using-SYSTEM-account.html

You can use CircularLogArchiver to archive old data
https://www.experts-exchange.com/articles/29108/Log-file-problem-CircularLogArchiver.html

Please post a screenshot of WinDirStat
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Pu YuAuthor Commented:
Thank you very much.

this is our FT service and  i can not install software on here

i will try another way to solve

thanks and best wishes
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