--- title: "Installation issues" slug: "installation-issues" updated: 2022-05-02T13:53:14Z published: 2022-05-02T13:53:14Z canonical: "docs.xtendise.com/installation-issues" --- > ## Documentation Index > Fetch the complete documentation index at: https://docs.xtendise.com/llms.txt > Use this file to discover all available pages before exploring further. # Installation issues Please check the following for potential misconfigurations: #### ERS API validation fails - Check the **ers-xtendise** user credentials - Check the ERS API IP address configurations - the IP address should be the IP address of the Primary Policy Administrations Node in your ISE deployment. - Check if ERS API is enabled - Check the connectivity issue - open a web browser on the XTENDISE server and open the following address https://:9060/ers/sdk - the web browser should ask for credentials (Use the **ers-xtendise** user to access the ERS API SDK). If the browser fails to open the web page, check the connectivity between XTENDISE and PAN ISE node on the port TCP/9060. #### ERS MNT validation fails - Check the **mnt-xtendise** user credentials - Check the MNT API IP address configurations - the IP address should be the IP address of the Primary Monitoring Node in your ISE deployment. - Check the connectivity issue - open a web browser on the XTENDISE server and open the following address https:///admin/API/mnt/Session/ActiveCount - the web browser should ask for credentials (Use the **mnt-xtendise** user to access the ERS API SDK). If the browser fails to open the web page, check the connectivity between XTENDISE and MNT ISE node on the port TCP/443. #### User Access validation fails - Check the XTENDISE account credentials in your Active Directory - Check the connectivity issue - open a command line and try to open telnet session on the port TCP/389 or TCP/636 to the configured domain controller. - Make sure that that the user you are testing is a member of the XTENDISE Administrator AD group.