No connection to port 80 after update to 2.3.4.150

[H_Local]

Hub not responding after upgrade to 2.3.4.150

For C-5 and newer hubs, a blue LED means that platform isn't starting. For C-4 hubs is normal. Can you please send a private message to @support_team so we can further investigate?

Maybe notify @Hubitat_Staff as it seems you are not the only one.

This link might also provide a solution

Updating Hub

Try using the diagnostics tool on port 8081 to download latest firmware then use the previous version button to switch to the new version. This may get around whatever issue the regular UI is having.