I am preparing for Exchange Online to migrate all of our mailboxes to the cloud using a hybrid solution offered by microsoft. In that solution, they have stated a requirement to have an ADFS server and an DirSync server.
Now when I build our servers, all the ports are locked down by default by our hosting company. I am trying to keep this as secure as possible. I am assuming that ADFS needs to be externally facing. What ports will I need to open for the external connectivity.
Also what ports will i require for the internal connectivity between our internal servers.
Lastly, does the DirSync tool need external access and if so what ports are required internally and externally or does the DirSync just need to connect to the ADFS server from the Domain Controller?
Please help! Newbie with Office 365.