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Connecting a Active Directory Domain Controller on a specific port

Posted on 2013-11-12
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Last Modified: 2013-11-24
Heyas,

One of the PC on the network can't connect to the Windows DC it can ping with no issues, but when I try telnet through to it on the port 389 the PC is rejected. This is the only PC on the network that is doing this I have tried rejoining it to the domain with no success.

Any other ideas, bare in the mind I am a novice with AD.
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Question by:Zack
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by:Sandeshdubey
ID: 39643835
Disable the window firewall and antivrus if any and reboot the cleint machine and check.If any thirdy part security application is installed then disable the same too.
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Expert Comment

by:Mahesh
ID: 39643840
can you please if PC is able to telnet itself on any well known port ?
For example, TCP 135, 445
If not,
Please disable firewall and antivirus software if any to check if installed antivirus is blocking him from communicating with DC ?
Also check how many network cards does this PC has ?
If you found multiple, then please disable all unnecessary cards and check ?
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Author Comment

by:Zack
ID: 39646285
Heyas,

Done all of these, anything on the DC I should check.

Thank you.
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Expert Comment

by:Sandeshdubey
ID: 39646921
Disable all the third part service i.e try clean boot and check.
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Author Comment

by:Zack
ID: 39646971
Nothing again, update I can't access the PC itself via telnet from the DC. Does this provide any further insight?
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Expert Comment

by:Mahesh
ID: 39647136
Please try to telnet PC from same PC only instead of DC and check if its able to telnet itself
Please download PortQueryUI tool from microsoft and check if you are able  to telnet domain controller
Thnaks
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Author Comment

by:Zack
ID: 39647152
What do you mean? "Please try to telnet PC from same PC only instead of DC and check if its able to telnet itself."

Thank you.
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Expert Comment

by:Sandeshdubey
ID: 39647153
You can also use wireshark tool to check the same.
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Mahesh earned 500 total points
ID: 39647174
You need to check if PC is responding to telnet protocol
Please logon to affected PC and open up command prompt and try "telnet ownIP 135"
If its unable to telnet itself, then there might be your problem root cause.
If this is win7 machine then you may need to install telnet feature first.
Hope that helps
Thanks
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Author Closing Comment

by:Zack
ID: 39673816
Thank you.
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