Solution

Use the display dns host ip command to verify that the specified domain name is in the cache.

If the specified domain name does not exist, verify that dynamic domain name resolution is enabled and that the DNS client can communicate with the DNS server.

If the specified domain name is in the cache, but the IP address is incorrect, verify that the DNS client has the correct IP address of the DNS server.

Verify that the mapping between the domain name and IP address is correct on the DNS server.