I'm having weird idrive backup failures from only some PC's behind upgraded Microtik routers.
Downgrading to 6.37.5 and backups will start working again.

I've opened a ticket with the idrive tech, but I have no idea where to start with troubleshooting this issue.
Here's example of one network:
Router firmware update 3/9/2017

PC1
Backup 3/8/2017 backup ok
Backup 3/10/2017 backup failed due to "connection issues"

PC2
Backups still running fine 3/15/2017
Backups started failing 3/16/2017

Downgrade to 6.37.5 firmware and backups start working again.

Don't think a supout.rif is going to help with this.
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Any thoughts welcome.