If you’re seeing “tag is unavailable” errors when attempting to protect a VM using vSphere tags or “QueryAllCategoryInfos failed. There was no endpoint listening at https://vcenteraddress/lookupservice/sdk that could accept the message” error when editing the backup job.
![](https://rhyshammond.com/wp-content/uploads/2023/02/Backup-failing.jpg)
![](https://rhyshammond.com/wp-content/uploads/2023/02/Edit-Backup-Job.jpg)
I recommended investigating DNS in your environment, in my case performing a nslookup of the Center FQDN from the VBR server would fail.
![](https://rhyshammond.com/wp-content/uploads/2023/02/DNS-issues.jpg)
Once the DNS issue was resolved (restarted the DNS server), Veeam could look up the vSphere tags without issues and the backups resumed without any further errors.
![](https://rhyshammond.com/wp-content/uploads/2023/02/backup-working.jpg)