# Error when istalled Wowza Engine on server **URL:** \ **Category:** Wowza Streaming Engine\ **Created:** [January 11, 2021, 7:21pm UTC](https://community.wowza.com/t/error-when-istalled-wowza-engine-on-server/92667 "2021-01-11T19:21:37Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Wiebe\_Veenstra1](https://avatars.discourse-cdn.com/v4/letter/w/91b2a8/32.png) [@Wiebe\_Veenstra1](https://community.wowza.com/u/Wiebe_Veenstra1)\ **Post date:** [January 11, 2021, 7:21pm UTC](https://community.wowza.com/t/error-when-istalled-wowza-engine-on-server/92667/1 "2021-01-11T19:21:37Z")
Hi guys! I have installed Wowza Engine on my Windows Server 2019. When i am going tot the enginemanager and i type my username and password, and i see this error: REST API Authorization failed when connecting to server: What is the problem ? ---
**Author:** ![Rose\_Power-Wowza\_Com](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/rose_power-wowza_com/32/431_2.png) [@Rose\_Power-Wowza\_Com](https://community.wowza.com/u/Rose_Power-Wowza_Com)\ **Post date:** [January 12, 2021, 3:15pm UTC](https://community.wowza.com/t/error-when-istalled-wowza-engine-on-server/92667/2 "2021-01-12T15:15:05Z")
> [@Wiebe\_Veenstra1](#): > > REST API Authorization failed when connecting to server: This error most likely means that your server can’t connect to the licensing server and could be because the server doesn’t have access to the internet. You can check that the proper ports (port 80) are open to send HTTP data over TCP on the internet: Here is an installation troubleshooting guide for you: > **[Troubleshoot Wowza Streaming Engine licensing errors a](https://www.wowza.com/docs/troubleshoot-wowza-streaming-engine-licensing-errors-at-startup)** > > Try these troubleshooting steps to resolve errors that occur when Wowza Streaming Engine can't connect to the license server.