# How to connect to Ignition OPC-UA server **URL:** \ **Category:** Ignition\ **Tags:** perspective, ignition81\ **Created:** [January 26, 2022, 6:40pm UTC](https://forum.inductiveautomation.com/t/how-to-connect-to-ignition-opc-ua-server/55413 "2022-01-26T18:40:51Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Sina\_Zadeh](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/sina_zadeh/32/31967_2.png) [@Sina\_Zadeh](https://forum.inductiveautomation.com/u/Sina_Zadeh)\ **Post date:** [January 26, 2022, 6:40pm UTC](https://forum.inductiveautomation.com/t/how-to-connect-to-ignition-opc-ua-server/55413/1 "2022-01-26T18:40:51Z")
Hi There I have accidentally deleted the built in OPC UA. which is Ignition OPC-UA Server. What is the best way to connect to that again? What is the Ignition OPC-UA Server URL Endpoint? Should I uninstall Ignition and install back again? Cheers Sina ---
**Author:** ![dkhayes117](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dkhayes117/32/68344_2.png) [@dkhayes117](https://forum.inductiveautomation.com/u/dkhayes117)\ **Post date:** [January 26, 2022, 6:51pm UTC](https://forum.inductiveautomation.com/t/how-to-connect-to-ignition-opc-ua-server/55413/2 "2022-01-26T18:51:14Z")
You should be able to reconnect by simply setting the server connection backup. [Ignition’s OPC UA Server - Ignition User Manual 8.1 - Ignition Documentation (inductiveautomation.com)](https://docs.inductiveautomation.com/display/DOC81/Ignition%27s+OPC+UA+Server) Try this for the end point `opc.tcp://localhost:4096` then use `opcuauser` as username and `password` as password ---
**Author:** ![Sina\_Zadeh](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/sina_zadeh/32/31967_2.png) [@Sina\_Zadeh](https://forum.inductiveautomation.com/u/Sina_Zadeh)\ **Post date:** [February 16, 2022, 11:05pm UTC](https://forum.inductiveautomation.com/t/how-to-connect-to-ignition-opc-ua-server/55413/3 "2022-02-16T23:05:07Z")
opc.tcp://localhost:62541/discovery Worked for me 4096 wasn’t the correct port