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check if you are running some firewall or internet security on that machine (even windows build-it)<br />
check that machine in AD if it appears correctly in Computers or appropriate OU (you can also try reset computer account in AD if you are not sure)
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Not sure what &quot;AD&quot; or &quot;OU&quot; mean. &nbsp; Please explain. &nbsp; Thanks.
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AD = Active Directory<br />
OU = Organizational Unit<br />
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I suppose you are working in domain enviroment
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I guess so, but networking is a complete mystery to me, so I need step-by-step instructions about what to do. &nbsp; Can I try to remove the computer from the domain then reconnect it?
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I just removed it from the domain and connected it to &quot;WORKGROUP&quot;. &nbsp; I then changed it back to the domain and it worked fine. &nbsp; Lucky guess!
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I checked the AD on the server and added it as it was not present, so I was then able to have the workstation rejoin the domain.
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<div class="content wysiwyg-content">
I have a domain set up and one of the computers denies access from the other ones. &nbsp; I can see it in Network Places, but when I try to connect to it, I get the attached error message. &nbsp; The computer in question is running Windows 7 Professional. &nbsp; It was previously connected to the domain,but it now shows as &quot;unauthenticated&quot; in the system tray. &nbsp; I am able to connect from it to the other computers on the domain.<a href="https://filedb.experts-exchange.com/incoming/2013/05_w21/656115/Error-Message.docx" target="_blank" class="file-inline" title="Error Message (9 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>Error-Message.docx</a>
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Error-Message.docx

I have a domain set up and one of the computers denies access from the other ones.   I can see it in Network Places, but when I try to connect to it, I get the attached error message.   The computer in question is running Windows 7 Professional.   It was previously connected to the domain,but it now shows as "unauthenticated" in the system tray.   I am able to connect from it to the other computers on the domain.

Why can I not connect to another computer on my domain?

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.