H202 Error Multi-user Mode on QuickBooks

Quickbooks Error H202 Switching To Multi-user Mode

We are getting errors when we have more than one person logged in. We updated all the versions (we think) and we still get the error message.
When we log in, it automatically goes to single user.We have seen most of the users get this QuickBooks error H202 when they are try to get on to QB multi user mode.
Please assist.

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