Does Little Little Snitch 4 block connections during login?

Solution 1:

From Little Snitch itself…

Login Connections

While no user is logged in or a login is in progress, Little Snitch cannot display Connection Alerts. It therefore creates suggestions for all connection attempts that occur during that time.

See the Little Snitch Help, chapter Rule suggestions for more information.

& detail from just the first entry in that table…

On 27 10 2019, ARDAgent tried to establish a connection to 100.102.5.131. The request was denied automatically during login.

So, yes, it will block attempts by default until you edit the suggestions into actual approved rules.