Hi @user1
This type of connection error can come up for many reasons, including firewall settings on your computer and/or browser, but before investigating more you might just need to stop the server and restart it. Example how-to:
Galaxy resources
- Quick start: Get Galaxy - Galaxy Community Hub
- Tutorials: Galaxy Training!
- Docs: Galaxy Documentation — Galaxy Project 23.1.1.dev0 documentation
If you need more help, please explain a bit more about your server. Include anything relevant: Version of Galaxy? Where sourced? Default configuration or ? Is this the first time starting it up?
Let’s start there, thanks!