This article applies to PRTG Network Monitor 13.x.3 or later

Solving an Active Directory Login Issue

If you cannot login to PRTG with Active Directory users and encounter the error message Your login has failed. Please try again!, try the following: Provide explicit credentials for Active Directory access in PRTG and adjust the rights of the corresponding AD user via Active Directory Domain Services.

Steps to Go

1. In your PRTG installation, choose Setup | System Administration | Core & Probes (in previous versions under "System & Website").
2. In section Active Directory Integration, select the option Use explicit credentials.
3. Enter an AD access user name for AD integration and provide the corresponding access password below. This AD user must have domain administration rights.
4. Give this AD account (that PRTG uses now to access the Active Directory) the rights to read out the memberOf attribute of the users in the Active Directory. By default, AD user objects have this right only for their own user objects.
   Note: Set the Read Member Of attribute at OU level so you do not have to set the memberOf attribute for each current and future AD user individually. See this TechNet article for a fix if you encounter issues with that process.
   For details about AD attributes, please refer to the following article in the Microsoft Developer Network: User Security Attributes

Try login to PRTG with the AD users again. It should work now with this change in the AD settings.

For more details about AD integration in PRTG, please see also PRTG Manual: Active Directory Integration.