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This could possibly be a firewall issue. Here is a Microsoft TechNet article about <a href="https://technet.microsoft.com/en-us/library/bb727063.aspx" rel="ugc">Active Directory Replication Over Firewalls</a>
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The nTDSConnection object cn=bbf51d89-390c-4049-acee<wbr />-3a753bc13<wbr />dea,cn=ntd<wbr />s settings,cn=,cn=servers,cn<wbr />=eu-aus,cn<wbr />=sites,cn=<wbr />configurat<wbr />ion,dc=ccu<wbr />,dc=,dc=co<wbr />m is conflicting with cn=68dc297e-d4d1-4eba-858d<wbr />-c26455972<wbr />907,cn=ntd<wbr />s settings,cn=eudc30aus,cn=s<wbr />ervers,cn=<wbr />s,cn=sites<wbr />,cn=config<wbr />uration,dc<wbr />=ccu,dc=,d<wbr />c=com. Using cn=bbf51d89-390c-4049-acee<wbr />-3a753bc13<wbr />dea,cn=ntd<wbr />s settings,cn=,cn=servers,cn<wbr />=eu-aus,cn<wbr />=sites,cn=<wbr />configurat<wbr />ion,dc=ccu<wbr />,dc=,dc=co<wbr />m <br />
<br />
on one affected server this is the error?
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Based on the info you just posted it looks like you have Conflicting DC names, the same server has two names in Sites &amp;&nbsp;Services.
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sysvol run every week , so most servers were demoted last week can this be reason if yes, then why
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you mean at the time of demotion and promoting another server name was same but we generally rename the new server?
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The nTDSConnection object cn=bbf51d89-390c-4049-acee<wbr />-3a753bc13<wbr />dea,cn=ntd<wbr />s settings,cn=eudc30aus,cn=s<wbr />ervers,cn=<wbr />eu-aus,cn=<wbr />sites,cn=c<wbr />onfigurati<wbr />on,dc=ccu,<wbr />dc=clearch<wbr />annel,dc=c<wbr />om is conflicting with cn=68dc297e-d4d1-4eba-858d<wbr />-c26455972<wbr />907,cn=ntd<wbr />s settings,cn=eudc30aus,cn=s<wbr />ervers,cn=<wbr />eu-aus,cn=<wbr />sites,cn=c<wbr />onfigurati<wbr />on,dc=ccu,<wbr />dc=clearch<wbr />annel,dc=c<wbr />om. Using cn=bbf51d89-390c-4049-acee<wbr />-3a753bc13<wbr />dea,cn=ntd<wbr />s settings,cn=eudc30aus,cn=s<wbr />ervers,cn=<wbr />eu-aus,cn=<wbr />sites,cn=c<wbr />onfigurati<wbr />on,dc=ccu,<wbr />dc=clearch<wbr />annel,dc=c<wbr />om<br />
<br />
what is the meaning of above
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I already answered that above. Providing clearer information will get more assistance. Right now your posts are all over the place and discussing multiple things. Let's work on one thing at a time. What is the first issue you are having?
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The nTDSConnection object cn=bbf51d89-390c-4049-acee<wbr />-3a753bc13<wbr />dea,cn=ntd<wbr />s settings,cn=eudc30aus,cn=s<wbr />ervers,cn=<wbr />eu-aus,cn=<wbr />sites,cn=c<wbr />onfigurati<wbr />on,dc=ccu,<wbr />dc=clearch<wbr />annel,dc=c<wbr />om is conflicting with cn=68dc297e-d4d1-4eba-858d<wbr />-c26455972<wbr />907,cn=ntd<wbr />s settings,cn=eudc30aus,cn=s<wbr />ervers,cn=<wbr />eu-aus,cn=<wbr />sites,cn=c<wbr />onfigurati<wbr />on,dc=ccu,<wbr />dc=clearch<wbr />annel,dc=c<wbr />om. Using cn=bbf51d89-390c-4049-acee<wbr />-3a753bc13<wbr />dea,cn=ntd<wbr />s settings,cn=eudc30aus,cn=s<wbr />ervers,cn=<wbr />eu-aus,cn=<wbr />sites,cn=c<wbr />onfigurati<wbr />on,dc=ccu,<wbr />dc=clearch<wbr />annel,dc=c<wbr />om<br />
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I am getting this error on server having backlogs of sysvol, I am not able to understand this error
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You mean same server name eudc30aus?
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Yes. The error you posted shows that all the servers mentioned have the same name
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but I have one server EUDC30AUS? never had 2?
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Have you checked the sites and services area to be sure that the one server only has one name?
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<div class="content wysiwyg-content">
I have DC’s with 100 or more backlogs for sysvol<br />
<br />
We have 350 DC’s in our environment<br />
<br />
What can be the reason<br />
<br />
They are some windows server 2003 and 2008 and 2012
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I have DC’s with 100 or more backlogs for sysvol

We have 350 DC’s in our environment

What can be the reason

They are some windows server 2003 and 2008 and 2012

ACTIVE DIRECTORY

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.