Should I allow LDAPS connectivity to our internal DC

I'm a network engineer with my company, but not a security expert. To enable new functionality of 1 of our record systems, which is hosted, the software vendor wants us to allow LDAPS connectivity to our internal domain controller. My gut tells me we shouldnt do this.  What are the pros and cons of allowing this traffic? What  would the worst case scenario be? If we were to allow it what would the best practice be?

Thanks in advance!!
johncolferSecurity ConsultantAsked:
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Joshua HopkinsPresidentCommented:
You could setup a read-only dc within a DMZ and then within your firewall only allow the IP(s) that would need to authenticate to it access from your WAN.
johncolferSecurity ConsultantAuthor Commented:
I thought of that, but the App needs to be able to write to the DC. The new functionality is called "Apply Online" and allows applicants create a username and password so they can save and resume their application. So I guess a read only DC will not work in this instance.
Joshua HopkinsPresidentCommented:
I would suggest that you then setup a new domain in a DMZ. Then create a trust between your internal AD and the new one. You could also look at federated services as an option.

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