Hello,
Not sure why you are attaching to MS from each of your client machines 
( for admin ?).
Make sure on the machines you are having issues that you are able to 
resolve networker server name, check your host files and servers file.
Other then that this machines may not have been created as client on the 
server you are trying to attach.
lastly, you may need to add system AT machinename DOT com to administrator list 
for each of the machines that you tried to use as admin gateway ( This to 
me opens up security and access issues-avoid doing this)
HTH

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