[Samba] Upgrade to 4.7.0 Replication fails on DC2

[Micha Ballmann]

Hello Community,

after an upgrade from samba 4.6.7 to samba 4.7.0, now i have a 
replication issue on my second domain controller. When i type 
"samba-tool drs showrepl" all correctly synced, except the following:

==== INBOUND NEIGHBORS ====

DC=DomainDnsZones,DC=mydomain,DC=de
Default-First-Site-Name\DC1 via RPC
DSA object GUID: 2abe9f52-9cd5-43c8-9fc2-a67eba27f551
Last attempt @ Wed Oct 4 16:12:02 2017 CEST was successful
0 consecutive failure(s).
Last success @ Wed Oct 4 16:12:02 2017 CEST

DC=DomainDnsZones,DC=mydomain,DC=de
Default-First-Site-Name\DC3 via RPC
DSA object GUID: 0893c21b-9e09-4bdf-9a3a-b55304643222
Last attempt @ Wed Oct 4 16:12:06 2017 CEST was successful
0 consecutive failure(s).
Last success @ Wed Oct 4 16:12:06 2017 CEST

CN=Schema,CN=Configuration,DC=mydomain,DC=de
Default-First-Site-Name\DC1 via RPC
DSA object GUID: 2abe9f52-9cd5-43c8-9fc2-a67eba27f551
Last attempt @ Wed Oct 4 16:10:21 2017 CEST was successful
0 consecutive failure(s).
Last success @ Wed Oct 4 16:10:21 2017 CEST

CN=Schema,CN=Configuration,DC=mydomain,DC=de
Default-First-Site-Name\DC3 via RPC
DSA object GUID: 0893c21b-9e09-4bdf-9a3a-b55304643222
Last attempt @ Wed Oct 4 16:10:21 2017 CEST was successful
0 consecutive failure(s).
Last success @ Wed Oct 4 16:10:21 2017 CEST

DC=mydomain,DC=de
Default-First-Site-Name\DC1 via RPC
DSA object GUID: 2abe9f52-9cd5-43c8-9fc2-a67eba27f551
Last attempt @ Wed Oct 4 16:12:34 2017 CEST failed, result 58 
(WERR_BAD_NET_RESP)
897 consecutive failure(s).
Last success @ Wed Oct 4 15:38:43 2017 CEST

DC=mydomain,DC=de
Default-First-Site-Name\DC3 via RPC
DSA object GUID: 0893c21b-9e09-4bdf-9a3a-b55304643222
Last attempt @ Wed Oct 4 16:12:39 2017 CEST failed, result 58 
(WERR_BAD_NET_RESP)
413 consecutive failure(s).
Last success @ Wed Oct 4 15:32:31 2017 CEST

DC1 and DC3 are working fine. I hope you can give some advices.

Best regards

Micha