Tool for checking domain authentication ports

I am having difficulty getting a PC connected to a domain over a site to site VPN to head office. Engineer at head office is saying all ports open. I can do an nslookup and can qery server names but am not getting password prompt just error.
Is there a tool I can use to identify what port is not open or having issues.
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Sid_FAsked:
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Sid_FConnect With a Mentor Author Commented:
This tool PortQryUI.exe and ldp.exe allowed me to identify the issues.
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tjc123IT DirectorCommented:
Is the PC you are trying to connect to the domain using a static IP?  Set it to DHCP, confirm it received an IP properly and can talk to the DCs on the other site, try adding it to the domain again.
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piyushranusriSystem Cloud SpecialistCommented:
is your vpn connetion is configured to connect to domain ?
see vpn policy if you applied
does you apply GPO that system can join domain only if they are in LAN ?
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Sid_FAuthor Commented:
Resolved
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