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Can't Reach the port 445 for my domain controler / Change the 445 port

Posted on 2010-08-21
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Last Modified: 2013-12-14
Hi everyone,

I've got a little problem with the port 445. I have to external domain controler wich i try to connect to.
I used telnet mydomaincontrol 445 and the connexion fail. But when i try it with my other ADSL line, it work. So i don't think the port is closed on the external side.

I opened the port 445 on my firewall rules but impossible to access to that port.
I'm with a french ISP called orange, its a fiber optic connexion.

Any idea how to reach that port ?

Or maybe i can change the port ? transfert the 445 port on an other port with a nat rule. But how the others domain control (internal) would know it ?

Thanks
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Question by:Tchougui
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Expert Comment

by:DewFreak
ID: 33493111
Are you sure your ISP does not filter that port?  That is a dangerous port to have exposed to the public internet so it is possible that they block it.
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Author Comment

by:Tchougui
ID: 33493209
Yeah but my computers can't join the domain if that port is closed. The company doesn't want to use vpn.
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LVL 6

Expert Comment

by:DewFreak
ID: 33493225
ok, maybe the decision makers are not properly informed.  I don't know the layout of your company's network so I can't offer more that that.  Is it only your PC's that need to connect or an entire other office?
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Author Comment

by:Tchougui
ID: 33493237
Its the entire office but every user have a laptop and move often off the company.
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LVL 6

Expert Comment

by:DewFreak
ID: 33493260
VPN really is the way to go.  Even implementing PPTP would be better and wouldn't cost you anything.  Do they not want to use VPN because of cost or just laziness of having to login via VPN?
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Author Comment

by:Tchougui
ID: 33493382
I think its more lasiness then something else. So you think that vpn is the way to go.
Maybe i should put a new domain controler in the local office (internal) wich would be connected to the external via vpn and the user would just connect to the local Domain controler ?

And for the external user a vpn client ?
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Accepted Solution

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DewFreak earned 500 total points
ID: 33493390
That would be a preferred model.  An AD at each location doing a branch to branch VPN.  Mobile users would use a VPN client on their laptops to connect to the main company firewall/VPN concentrator.
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Author Closing Comment

by:Tchougui
ID: 33493414
Thank you, i'll try that.
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