I created a Multi Master supplier and set up the replication to a consumer.
So long so good. 
Then I wanted to upgrade the consumer to a master and using the console I modified the settings of the consumer to "Multimaster" and I set up a replication agreement to the supplier.
The I create an object the server which was the consumer.
At this point the problems begin: the status page of the replication tells "Incremental update has failed and requires adiministration action LDAP error: Can't contact LDAP Server. Error -1.
REsearching the issue I found that in the replication agreement of a running multimaster you have 3 lines containing the following:
nsds50ruv: {replicageneration} 561e6cd4000000010000
nsds50ruv: {replica 1 ldap://ldap1.syntlogo.local:389} 561f9af1000000010000 561fa88c000000010000
nsds50ruv: {replica 2 ldap://ldap2.syntlogo.local:389} 561fa030000000020000 561fa84d000000020000

but in the failing configuration the lines are 4: 
nsds50ruv: {replicageneration} 56279cce000000010000
nsds50ruv: {replica 1 ldap://ldap1.syntlogo.local:1389} 5628c0b3000000010000 562f3fe3000000010000
nsds50ruv: {replica 2 ldap://ldap2.syntlogo.local:1389} 5629cae3000000020000 5629cae3000000020000
nsds50ruv: {replica 65535 ldap://ldap2.syntlogo.local:1389} 562f43300000ffff0000 562f50210000ffff0000

What makes me suspicious is the line containing the replica 65535, indicating that chainging the setting from consumer to suplier some old information is not being removed.

389-ds version 1.3.3.1 build 2015.218.023
Administration Server 1.1.38 Build 2015.068.1937
Cosole Framework 1.1.14
Thank you,
Giovanni