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Failed to prepare forest in skype for business 2019

Moataz Shaaban 1 Reputation point
2023-05-05T12:15:06.39+00:00

Hello,

I was trying to upgrade my skype for business 2015 environment and while installing the new servers the prepare forest step failed with the following error ,could anyone help

  Create Active Directory object "Topology Azure Settings".   05/05/2023 12:38:00     
     └    TaskFailed: Task execution failed.   05/05/2023 12:38:00   Error 
     └    Error: Active Directory operation failed on "MYDC.mydomain.com". You cannot retry this operation: "The parameter is incorrect 00000057: LdapErr: DSID-0C0910D5, comment: Error in attribute conversion operation, data 0, v4f7c" 
▼ Details 
└ Type: ADOperationException 
└ ▼ Stack Trace 
    └   at Microsoft.Rtc.Management.ADConnect.Session.ADSession.AnalyzeDirectoryError(ADConnection connection, DirectoryRequest request, DirectoryException de, Int32 totalRetries, Int32 retriesOnServer) 
at Microsoft.Rtc.Management.ADConnect.Session.ADSession.ExecuteModificationRequest(ADObjectBase entry, DirectoryRequest request, ADObjectId originalId, Boolean emptyObjectSessionOnException) 
at Microsoft.Rtc.Management.ADConnect.Session.ADSession.Save(ADObjectBase instanceToSave, IEnumerable`1 properties) 
at Microsoft.Rtc.Management.Deployment.AD.LcTopologyAzureSettingsContainer..ctor(ADSession session, ADObjectId containerId) 
at Microsoft.Rtc.Management.Deployment.LcForest.CreateLcsGlobalADObjects() 
at Microsoft.Rtc.Management.Deployment.LcForest.PrepareForest() 
 
└ ▼ Additional Details 
    └   Error: The requested attribute does not exist. 
▼ Details 
└ Type: DirectoryOperationException 
└ ▼ Stack Trace 
    └   at System.DirectoryServices.Protocols.LdapConnection.ConstructResponse(Int32 messageId, LdapOperation operation, ResultAll resultType, TimeSpan requestTimeOut, Boolean exceptionOnTimeOut) 
at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request, TimeSpan requestTimeout) 
at Microsoft.Rtc.Management.ADConnect.Connection.ADConnection.SendRequest(DirectoryRequest request, LdapOperation ldapOperation) 
at Microsoft.Rtc.Management.ADConnect.Session.ADSession.ExecuteModificationRequest(ADObjectBase entry, DirectoryRequest request, ADObjectId originalId, Boolean emptyObjectSessionOnException)
Skype for Business
Skype for Business
A Microsoft communications service that provides communications capabilities across presence, instant messaging, audio/video calling, and an online meeting experience that includes audio, video, and web conferencing.
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  1. JimmyYang-MSFT 50,446 Reputation points Microsoft Vendor
    2023-05-08T09:29:51.2166667+00:00

    Hi @Moataz Shaaban

    Before prepare forest in Skype for Business2015, please make sure you have installed the March 2016 cumulative update 6.0.9319.235 for Skype for Business Server 2015, core components.

    In this forum, there is also a similar question talking about this, you could try to follow this answer's steps to see if it works for you:

    https://social.technet.microsoft.com/Forums/en-US/2eed085a-6d89-4826-96e1-06a4c80942fb/prepare-current-forest-error-deployment-skype-for-business

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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