Avamar: VM Backup, Restore Fails "Cannot establish connection with server" avtar Error 10541

Multiple errors occur inside both the avvcbimage.log file, and the avtar.log file.

• Avvcbimage.log

avvcbimage Warning <6653>: CTL workorder "MOD-1289960020340" non-zero exit status 'code 158: Cannot establish connection with server (possible network or DNS failure)'

• Avtar.log

avtar Error <10541>: Failed to resolve Data Domain Server name

Avamar VMware Proxy cannot resolve the Data Domain server.

The DNS entries (/etc/resolv.conf) on the Avamar VMware Proxy must be reviewed.

Troubleshooting Instructions: 

1. SSH to proxy in question
2. From the error avtar Error <10541>, record the Data Domain hostname.
3. Run the following command on the proxy (replace DataDomainHostname with the Data Domain hostname). This uses the configured nameservers in /etc/hosts and checks if the Data Domain can be resolved.

grep -oP '(?<=^nameserver\s)\S+' /etc/resolv.conf | xargs -I{} sh -c 'echo -n "{}: "; nslookup "DataDomainHostname" {} >/dev/null && echo "OK" || echo "FAIL"'

4. If the name resolution fails, determine if the configured nameservers are correct. 

• When the entries are correct and Data Domain hostname cannot resolve, investigate the Proxy's configured IP information, and redeploy with correct values. 
• If they are NOT correct, redeploy the proxies with the correct DNS entries.