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is it happening for specific client system or from all the computer? If it is specific system, perhaps the antivirus client or firewall is blocking, turn off and check if you are able to reach the SCCM server.
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This is for all the computers
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Are you able to access the workstations, is there any firewall / antivirus blocking the access. Please check from either side and update us.<br />
<br />
Check the client and server ports if they are open and reachable, check if the client is able to resolve the server. I believe you have configured the client access with HTTPS protocol, check if it supports both HTTP &amp;&nbsp;HTTPS<br />
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Check if your SCCM deployment domain account has full permission on the client computers, if you are trying for the domain joined computers.
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Hi Ganesh,<br />
<br />
ALl required ports are open. Also tried to uninstall antivirus and tested the connecting SCCM server . but no luck. COuld you suggest further troubleshooting steps on this
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<div class="content wysiwyg-content">
event log : DCOM was unable to communicate with the computerxxxx using any of the configured protocols; requested by PID &nbsp; &nbsp; 41d0 (D:\Program Files\Microsoft Configuration Manager\bin\x64\smsexec.ex<wbr />e).<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/11_w45/1204568/ccm.log" target="_blank" class="file-inline" title="ccm.log (2.2 MB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>ccm.log</a><br />
<a href="https://filedb.experts-exchange.com/incoming/2017/11_w45/1204569/rpc-error.png" target="_blank" class="file-inline" title="error screen shot dom error (33 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>rpc-error.png</a>
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ccm.log

rpc-error.png

event log : DCOM was unable to communicate with the computerxxxx using any of the configured protocols; requested by PID     41d0 (D:\Program Files\Microsoft Configuration Manager\bin\x64\smsexec.exe).

RPC server is unavailable while connecting to SCCM   while connecting to WMI using wmbemtest.

DCOM

Systems Center Configuration Manager (SCCM, formerly known as Systems Management Server) is Microsoft’s system software for managing large groups of not only Microsoft computers, but those running other operating systems, such as Linux, OS-X, and various mobile technologies.