I can't create a transactional replication

I have two databases identically in two SQL Server 2014 instances.

The problem is as follows. I can access from server A to B, I can create the publication in server A and access to that publication from server B. But when I finish to create the subscription in server B, I can't see it in server A.

The servers are in two differents LAN and the connection is through two proxy servers.