Finally, on each computer that participates in replication, make sure that the services file (located in the C:\Windows/system32/drivers/etc/ directory) contains entries for all the database servers.
The file might look like this:
techpubs27 4599/tcp # service for online instance denver techpubs28 4600/tcp # service for online instance boston
The file might should look the same as the file on host1:
techpubs27 4599/tcp # service for online instance denver techpubs28 4600/tcp # service for online instance boston