Active Directory Ports on firewall for password changing

I have an online portal that communicates with our 2008R2 AD server. The portal is used as a self service password changing/reset help desk. I am moving the self service portal it to another subnet and on another interface of our firewall.

The ports found here: https://technet.microsoft.com/en-us/library/dd772723(WS.10).aspx
Must all these ports be open on the firewall for the portal to communicate its password change requests with AD? Or just certain ones?
hbcitAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
All ports for Active Directory should be added to the firewall. Based on the link you have provided the only one that might not be required is port 25 as this is SMTP replication for Sites and Services. However to ensure that everything is going to work properly you should be adding all ports required.

Will.
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footechCommented:
Some products may require a subset of those ports, but it depends on how the product works.  For instance, some will just do a reset, others will first query AD for a matching user, etc.  I recently had to do something similar and had to open almost all of those.  One that may not be needed is UDP 67 and UDP 2535 which is used for DHCP.

If you want to try removing some of those, hopefully your firewall logs will help you out in telling you what is being used by your particular app.
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