Secondary not connecting? Maybe this can help

So yesterday my Windows 10 updated and something happened with Multiplicity and it didn't want to connect. I tried everything I could find online and nothing. So then I turned off the firewall and wouldn't you know it actually worked, but obviously we can't leave the firewall off and so after constant tinkering I found something that ended up working.

First you need to open up Windows Firewall with Advanced Security

Then you need to go to Inbound Rules by clicking it

Then you need to click on New Rule

Then here's what you need to select

Program>All Programs>Allow this connection>Private (Just select Private and only that)>Name it whatever you want

Then Finish

Cheers!