Dear Abegail S,

The problem is that I repair the connection using one method or another and the issue returns a few days later.  The can ONLY be accessed by one computer at a time, however both computers can access the file one at a time.  Below are the steps that I have checked already:

I have tried the following this time:

1. QB Database server manager is used each time I try another step/method to ensure that the network is repaired.
2. Update windows on both computers
3. Ensure multiuser mode
4. Make certain that
5. Ensure that hosting computer is set to “host multi-user access”.
1. Ensure slave computer is not set to host
6. Synch Data License Online   
1. Make sure license number is correct.
7. Back up company and restore back-up file
8. Make certain that all QB programs are allowed passthrough on Windows Defender Firewall

Error codes

1. Hosting Computer if slave computer has QB open:    
1. Error -6189, -816
2. Code 140704087491126
2. Slave computer if Hosting computer has QB open:
1. Error code H202
2. Error code -6190, -816

Thanks, Rick