Hello,
I hope you may have kept the same IP address and the host name to the server same.
Follow these Steps to Get all your clients back:
Getting the Default Domain Id of Older SEPM from Sylink.xml file.
1) Visit a Machine with SEP client Installed and which was Reporting to the SEPM server before the SEPM server went down.
2) Go to C:\Program Files\Symantec\Symantec Endpoint Protection
3) Open the Sylink.xml file, you may see something (as shown in the Picture)
This ID is in the sylink.xml file on the client computers in each domain.
The string in the sylink.xml file looks like: DomainId="B44AC676C08A165009ED819B746F1".
4) Take a Note of the DomainId.
Restoring the DomainId
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Log on to the console.
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In the console, click Admin.
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In the System Administrator pane, click Domains.
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Under Tasks, click Add Domain.
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Click Advanced.
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Open the text file, select and copy the domain ID, and then paste the domain ID into the Domain ID box.
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Click OK.
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(Optional) Repeat this procedure for each domain to recover.
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Under Tasks, click Administer Domain.
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Click Yes on the Administer Domain dialog box.
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Click OK.
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Restart all of the client computers.
All the Clients would be seen in Either "My Company" Group OR "Default Group".
Ofcourse, you may have to Create New Groups and Manually move them to the Respective Groups from the "My Company" Group OR "Default Group".
However, this would be more easier Method.
If these steps does not work, then ofcourse, SylinkReplacer would help you get all the clients back.
Try these Steps and Let us know if these helps!!