# General knowledge base | ManageEngine Vulnerability Manager Plus

## General

1. [The browser used to define target resources browser does not list all Active Directory objects or Workgroup resources](https://www.manageengine.com/products/desktop-central/configuration_resources_browser.html?vmp)
2. [The network browser does not list all the computers](https://www.manageengine.com/products/desktop-central/list_computers_network_browser.html?vmp)
3. [Cannot add and authenticate a user using Active Directory](https://www.manageengine.com/products/desktop-central/restricted-ad-user.html?vmp)
4. [Cannot add an IP scope for a remote office](https://www.manageengine.com/products/desktop-central/invalid-subnet-ip-address.html?vmp)
5. [Agent communication failed - Unable to reach gateway port](https://www.manageengine.com/products/desktop-central/agent_communication_failure.html?vmp)
6. [Encrypted key file uploaded](https://www.manageengine.com/products/desktop-central/import-ssl-decrypt-file.html?vmp)
7. [Cannot add an IP scope for a remote office](https://www.manageengine.com/products/desktop-central/invalid-subnet-ip-address.html?vmp)
8. [Agent communication failed - Unable to reach gateway port](https://www.manageengine.com/products/desktop-central/agent_communication_failure.html?vmp)
9. [Cannot add User - email id already exists](https://www.manageengine.com/patch-management/knowledge-base/user-with-email-id-already-exists.html)