# Troubleshooting

> If you encounter issues while installing, configuring, or using High Availability Add-on, refer to the following instructions on common troubleshooting operations:

If you encounter issues while installing, configuring, or using High Availability Add-on, refer to the following instructions on common troubleshooting operations:

* [Installation issue with port 53](https://docs.uipath.com/high-availability-add-on/other/latest/installation-guide/installation-issue-with-port-53#installation-issue-with-port-53)
* [Failed initial Redis installation](https://docs.uipath.com/high-availability-add-on/other/latest/installation-guide/failed-initial-redis-installation)
* [Firewall blocking HTTP connections](https://docs.uipath.com/high-availability-add-on/other/latest/installation-guide/firewall-blocking-http-connections)