Some times ISP blocks Tor network routing. This issue can be solved by enabling
Tor Bridges. To do this GOTO
Connection Screen ➔ Gear
Icon ➔ Enable Bridges
Tor routing can be blocked in China even when you are using default bridges.
This issue can be solved by connecting with Meek bridges. To do this GOTO
Connection Screen ➔ Gear
Icon ➔ Enable Bridges ➔ Customize bridges ➔ Meek-azure (China)
You can also provide custom bridges in Orion. To do this GOTO
Connection Screen ➔ Gear
Icon ➔ Enable Bridges ➔ Customize bridges ➔ Paste custom bridge ➔ paste your bridge string