
Hi @jason tan ,
There are many reasons for this situation, and I can't determine where the problem specifically occurs.
Check the steps that the Search Service Application is created correctly.
Try rerunning the psconfiguration wizard.
If the problem is still not resolved, please try the follow solutions:
Solution # 1
Simply change the application pool to use SharePoint Web Services System for search service applications and check.
- Go IIS
- In IIS > Expand server > Expand sites > Expand “SharePoint Web Services
- Now check all the GUID 1 by 1 in content view unless you find searchadmin.svc and searchservice.svc
- Right click GUID go to advance settings
- Change the application to “SharePoint Web Services” > Click OK
Solution # 2
Enable the timer job and do IIS reset:
- Run below PS command to enable the service.
- Enable-SPTimerJob job-application-server-admin-service
- Result ==> IsDisabled: False
- Do Net Stop sptimerv4
- Do Net start sptimerv4
- Do iisreset
Solution # 3
Ensure the account has full control permissions on the Search service application and IIS account used by this service application
- Open Central Admin > Select Security > Select “Configure service accounts”
- Select the search service application
- For “select account for this component” Select a account which has full permission
Solution # 4
Restarting Application Server and clear SharePoint Configuration Cache can fix this issue.
Solution # 5
Delete the search application and recreate it.
For more information, please refer to:
https://www.toddklindt.com/blog/Lists/Posts/Post.aspx?ID=378
https://learn.microsoft.com/en-us/sharepoint/administration/back-up-a-search-service-application
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