Addint a child domain process hangs in Replicating the schema directory partition

Hello everyone,
for practice proposes and exam preparations I have my own virtual private network setup on an PowerEdge R905 Machine (which is a beast) I have two networks and windows server 2008R2 on a DMZ zone setup as router to rout traffic between two of my networks.
My two networks are 192.168.10.0 - and 192.168.20.0. the 10 network has its own active directory setup, now on my 20 network I am trying to deploy a child domain. during the process everything is going just fine BUT the process of promoting the domain gets
stuck on Replicating The Schema Directory Partition. Can anyone tell me what the issue might be ? I tried everything that I could think of such as:
made sure the 20 network server is pointed to the DNS on the 10th server.
you can ping the IP address and the FQDN of 10 network from the 20 network.
I made sure all firewalls are disabled on both networks
on my 10 network I have created sites  and assigned the right subnets for each site
so please any hint and explanation is greatly appreciated

If firewalls are disabled between the 2 subnets then you are sure that all of the below ports are opened:
Client Port(s)
Server Port
Service
49152 -65535/UDP
123/UDP
W32Time
49152 -65535/TCP
135/TCP
RPC Endpoint Mapper
49152 -65535/TCP
464/TCP/UDP
Kerberos password change
49152 -65535/TCP
49152-65535/TCP
RPC for LSA, SAM, Netlogon (*)
49152 -65535/TCP/UDP
389/TCP/UDP
LDAP
49152 -65535/TCP
636/TCP
LDAP SSL
49152 -65535/TCP
3268/TCP
LDAP GC
49152 -65535/TCP
3269/TCP
LDAP GC SSL
53, 49152 -65535/TCP/UDP
53/TCP/UDP
DNS
49152 -65535/TCP
49152 -65535/TCP
FRS RPC (*)
49152 -65535/TCP/UDP
88/TCP/UDP
Kerberos
49152 -65535/TCP/UDP
445/TCP
SMB
49152 -65535/TCP
49152-65535/TCP
DFSR RPC (*)
Then make sure that the other subnet is across route not across NAT to avoid a lot of additional configurations.
Regards,
Housam Smadi

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    Parameter 2: 
    (NULL)
    Parameter 3: 
    (NULL)
    Parameter 4: 
    (NULL)
    Parameter 5: 
    (null)
    Parameter 6: 
    (null)
    Parameter 7: 
    (null)
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    Parameter 4: 
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    Parameter 5: 
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    Access is denied. (5)
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    Access is denied. 5
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    Access is denied. (5)
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    Supplemental information:
    Detection location: 
    1461
    Generating component: 
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    2014-08-14 04:16:56
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    Access is denied. (5)
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    Extended Error Parameters: 
    0
    Parameter 1: 
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    Parameter 2: 
    (NULL)
    Parameter 3: 
    (NULL)
    Parameter 4: 
    (NULL)
    Parameter 5: 
    (null)
    Parameter 6: 
    (null)
    Parameter 7: 
    (null)
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    Ivo

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