Service accounts to be able to reset password on windows

Hello, I have a service account that's being used by our VPN sonicwall, fortinet firewall, barracuda anti spam, MySQL, and zimbra email to be able to authenticate or query active directory. How can I make sure that this service account can and be able to reset password for users when they are logged in on one of those hardware?
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David Johnson, CD, MVPOwnerCommented:
How can I make sure that this service account can and be able to reset password for users when they are logged in on one of those hardware? You don't want this accounts password to change so make sure that its properties is never expire. This account must be a member of the domain admins or delegated to do a password change for a user. Normally this is not done by these items but by the user using ldap
SuperRootAuthor Commented:
I don't think domain admins is a good idea. Delegating password? What's the best practice to do so? I'd like it when a user is on an group or ou that the service account can reset it's password.
David Johnson, CD, MVPOwnerCommented:
anyone can change their own password BUT not another users password ONLY administrators or users with delegated permissions .. Those items mentioned use LDAP or kerberos  to query AD and get back a token.. they don't have the rights to change a pasword but simply ask AD if the username exists and if the password matches the username. which they then get an authorization token and this token then is used for further access.

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SuperRootAuthor Commented:
Thanks for your help! Can I follow the link below to grant permission to the service account?
David Johnson, CD, MVPOwnerCommented:
Yes that is the procedure
I would not recommend using one domain user account across all devices but assign each appliance its own domain user account which is delegated the necessary rights.

This adds in auditing and prevent and issue where one account gets locked out, it would affect one appliance and not all three
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