63558: Acronis Cyber Backup: Activity fails with "Failed to resolve the host name"

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Last update: Thu, 2020-06-25 09:04

Symptoms

Activity (backup, recovery, cleanup, etc) fails with the following error:

Failed to resolve the host name

Cause

The storage host name cannot be resolved to IP address and thus storage cannot be accessed. Hostname is either not resolved or is resolved incorrectly.

Solution

If backup destination is Acronis Cloud Storage, use Connection Verification Tool to troubleshoot the issue.

For other destinations check DNS settings for the affected server.

To troubleshoot the problem perform manual lookup of the hostname on the Agent machine. Open Command Prompt (Start -> Run -> type cmd -> press Enter) and issue the following command:

nslookup <hostname.to.lookup.com>
e.g. nslookup mybackupserver.com 

If the commands works, this should output the IP addresses of the host.

If the command returns an error, check the DNS configuration on the Agent machine:

  1. Issue command in Command Prompt: ipconfig /all.
  2. Look into the output and search for "DNS Servers".

  3. If no servers are specified or if incorrect DNS server is specified, check whether your computer uses DHCP or not:
    1. Press Win+R, then type ncpa.cpl and press Enter to open Network Connections window.
    2. Double-click on on the connection that represents your internet/active network connection and press the "Details" button.
    3. In Network connection details window, check if DHCP is enabled:

    4.  If DHCP is not enabled, you need to check and set the correct DNS server in network connection properties. Right-click on the connection that represents your internet/active network connection and select Properties. 
      In network adapter properties window, click on the TCP/IPv4 item, and then the Properties button. This will open a window that includes a section for DNS settings. Select Use the following DNS server addresses and specify the IP address of your DNS server.
    5. If DHCP is enabled, you should check if that DHCP server is configured correctly for providing DNS address. If you are sure that all settings are correct on your side, please contact your network administrator or Internet Service Provider for assistance.
  4. If DNS server is present on the list, check the settings on this DNS server. Сontact your network administrator or Internet Service Provider for assistance if needed.

If the hostname is not resolved to the correct IP :

  1. Check the contents of the file С:\Windows\System32\drivers\etc\hosts  on Agent machine and make sure that the host is not listed there with a wrong IP.
  2. If the host is not present there please try to clean DNS cache in case it became corrupted with inaccurate information: run the following command in Command Prompt: ipconfig /flushdns
  3. If the problem persists contact your network administrator or Internet Service Provider for assistance.

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