problems with Samba 4.7 in existing (Samba 4.2 based) domain

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problems with Samba 4.7 in existing (Samba 4.2 based) domain

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I'd like to get rid of our old Samba 4.2 servers (based on SerNet packages on CentOS6) acting as DC and installed a third server with new Samba 4.7.0 on Fedora 4.7.

Initially I had problems joining with problems described here
Using the quick hack from allowed me to join though (I don't think it's related to my problem, but I thought I better mention it anyway, I had several isCriticalSystemObject=TRUE entries in parent OUs without the flag)

After a successful join using samba-tool I get error message like that on both ends and replication is not successful:

Last attempt @ Thu Dec  7 11:59:06 2017 CET failed, result 31 (WERR_GENERAL_FAILURE)

newly joined DC7:
[2017/12/07 11:50:49.982738,  0] ../source4/librpc/rpc/dcerpc_util.c:737(dcerpc_pipe_auth_recv)
  Failed to bind to uuid e3514235-4b06-11d1-ab04-00c04fc2dcd2 for ncacn_ip_tcp:[1024,seal,krb5,,target_principal=GC/,abstract_syntax=e3514235-4b06-11d1-ab04-00c04fc2dcd2/0x00000004,localaddress=] NT_STATUS_UNSUCCESSFUL

old DC3:
[2017/12/07 11:53:19.630671,  0] ../source4/librpc/rpc/dcerpc_util.c:729(dcerpc_pipe_auth_recv)
  Failed to bind to uuid e3514235-4b06-11d1-ab04-00c04fc2dcd2 for ncacn_ip_tcp:[49152,seal,krb5,,target_principal=GC/,abstract_syntax=e3514235-4b06-11d1-ab04-00c04fc2dcd2/0x00000004,localaddress=] NT_STATUS_UNSUCCESSFUL

This looks like an auth (Kerberos) error, maybe related to:
Dec 07 11:55:49 krb5kdc[22191](info): AS_REQ (8 etypes {18 17 20 19 16 23 25 26}) NEEDED_PREAUTH: DC7$@MY.INTERNAL.DOMAIN for krbtgt/[hidden email], Additional pre-authentication required

Any ideas what's going wrong here?

(I already went through the usual first steps, time is in sync, dns entries were created and can be resolved properly)


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