Error 500 in transfer of OJS to another hosting "SQLSTATE[HY000] [1130] Host '127.0.0.1' is not allowed to connect to this MySQL server"

I’m so sorry @ojsmk3 but I completely missed your answers till now.

Looks like we have a brand new error to work with:

Fatal error: Uncaught Exception: DB Error: 
Table 'vydeq753_PLXOJSstfnDB7NM.sessions' doesn't exist

The error is telling the same in the frontend than in serverLog: you missed the ojs sessions table.

This table exists in every OJS so only 2 things would happen:
a) You didn’t create it in first place (something when wrong when moving from your former installation).
b) You ran the upgrade script and it breaks your installation.

You can read more about this here:

I’m sorry but in both cases, you need to full start the process till you get a full running OJS (as in former installation).

I think the easiest way is asking for professional help or move your journal to an existing hosting service (like pkp publishing services).

Cheers,
m.