Resolve Repadmin Error 58: Map GUID to Domain Controller in Active Directory Forest

Active Directory replication errors can be tricky to troubleshoot—especially when you're faced with cryptic GUIDs like 2bd3eedd-fbc7-43c5-ab58-bc50f3dae0ab._msdcs.bbntechinfo.com in repadmin /replsummary output. These GUIDs represent domain controllers, but without a direct name reference, identifying the source of the issue becomes a challenge. In this post, I’ll walk you through a PowerShell-based approach to map these GUIDs to actual domain controller names across your entire forest. Whether you're dealing with error 58 or tracking down stale replication metadata, this method will help you pinpoint the problematic DC quickly and accurately—saving you time and frustration.

 Below Powershell script will perform the check on each DC in the forest mentioned and return if the GUID matched with any of the DC. below script will work in Powershell 5.1

######################Script Starts#############################################

# Replace with your forest root domain

$forestRoot = "bbntechinofo.com"

$guidToFind = [guid]::Parse("replace here with your replication failing DC GUID")

# Create DirectoryContext for the forest

$context = New-Object System.DirectoryServices.ActiveDirectory.DirectoryContext("Forest", $forestRoot)

$forest = [System.DirectoryServices.ActiveDirectory.Forest]::GetForest($context)

foreach ($domain in $forest.Domains) {

    $domainName = $domain.Name

    Write-Host "`n--- Searching domain: $domainName ---" -ForegroundColor Cyan

    try {

        $dcs = Get-ADDomainController -Server $domainName -Filter *

        foreach ($dc in $dcs) {

            try {

                $computer = Get-ADComputer $dc.Name -Server $domainName

                $dcGuid = $computer.ObjectGUID

                if ($dcGuid -eq $guidToFind) {

                    Write-Host "`n✅ Match found!" -ForegroundColor Green

                    Write-Host "Domain       : $domainName"

                    Write-Host "DC Name      : $($dc.Name)"

                    Write-Host "DNS Hostname : $($dc.HostName)"

                    Write-Host "Site         : $($dc.Site)"

                    return  # Exit once match is found

                } else {

                    Write-Host "Checked $($dc.Name) - No match" -ForegroundColor DarkGray

                }

            } catch {

                Write-Warning "Could not retrieve computer object for $($dc.Name) in $domainName"

            }

        }

    } catch {

        Write-Warning "Failed to query domain controllers in $domainName"

    }

}

Write-Host "`n❌ No match found for GUID $guidToFind in forest $forestRoot" -ForegroundColor Red


##################Script Ends ################################################

Out put example below 

IF not Match it will re-turn like below 

Checked DCname  - No match


If match found means it will like below 


✅ Match found!
Domain       : bbntechinfo.com
DC Name      : DCname
DNS Hostname : FQDN of the DC
Site         : Which Particular Site. 

How to Identify Domain Controllers from GUIDs in AD Replication Errors (Error 58)Resolve

 Repadmin Error 58: Map GUID to Domain Controller in Active Directory Forest

 PowerShell Script to Trace Domain Controller from GUID in AD Replication 

FailuresTroubleshooting AD Replication Error 58: Find DC from GUID Across Forest

 Active Directory Forest-Wide DC GUID Lookup for Repadmin Errors

 Smart Way to Match GUID to Domain Controller in AD Using PowerShell

 Fixing Replication Failures: Identify Orphaned or Stale DCs from GUIDs

 Forest-Wide PowerShell Script to Resolve _msdcs GUID to Domain Controller

Step-by-Step Breakdown: How the Script Works

This PowerShell script helps Active Directory administrators identify which domain controller corresponds to a GUID seen in replication errors (like error 58 in repadmin /replsummary). It performs a forest-wide search to match the GUID to a live domain controller.

🔹 Step 1: Define the GUID

Start by copying the GUID from your replication error and assigning it to the $guidToFind variable. The script converts it to a [guid] object for accurate comparison.

$guidToFind = [guid]::Parse("your-guid-here")

Step 2: Connect to the Forest

The script uses System.DirectoryServices.ActiveDirectory.DirectoryContext to connect to the forest using its root domain name.

$context = New-Object System.DirectoryServices.ActiveDirectory.DirectoryContext("Forest", "bbeninfotech.com")

$forest = [System.DirectoryServices.ActiveDirectory.Forest]::GetForest($context)

Step 3: Enumerate All Domains

It loops through all domains in the forest using $forest.Domains, ensuring no domain is missed.

🔹 Step 4: Query All Domain Controllers

For each domain, it uses Get-ADDomainController -Server <domain> to list all DCs, then queries their corresponding computer objects to retrieve their ObjectGUID.

🔹 Step 5: Match the GUID

Each DC’s GUID is compared to the target GUID. If a match is found, the script prints the DC’s name, DNS hostname, and site.

🔹 Step 6: Output Results

If no match is found, the script informs you that the GUID may belong to a decommissioned or unreachable DC.

Use Cases

• Troubleshooting replication errors like error 58.
• Identifying orphaned or stale DCs.
• Validating metadata cleanup after DC removal.
• Auditing forest-wide DC health.