Fail To Get LetsEncrypt Certificate With Following Error

I had a virtual server and two sub server, on parent virtual server and one sub server I am able to get LE SSL certificate but on one sub server I am not able to get and it failed with following error -

Hi rahulsharma,
i have a similar problem on a brand new Debian 10 Install.

*. request failed : Web-based validation failed : Failed to request certificate :*
*Traceback (most recent call last):*
*  File "/usr/share/webmin/webmin/", line 198, in <module>*
*    main(sys.argv[1:])*
*  File "/usr/share/webmin/webmin/", line 194, in main*
*    signed_crt = get_crt(args.account_key, args.csr, args.acme_dir, log=LOGGER,, disable_check=args.disable_check, directory_url=args.directory_url,*
*  File "/usr/share/webmin/webmin/", line 106, in get_crt*
*    directory, _, _ = _do_request(directory_url, err_msg="Error getting directory")*
*  File "/usr/share/webmin/webmin/", line 46, in _do_request*
*    raise ValueError("{0}:\nUrl: {1}\nData: {2}\nResponse Code: {3}\nResponse: {4}".format(err_msg, url, data, code, resp_data))*
*ValueError: Error getting directory:*
*Data: None*
*Response Code: None*
*Response: <urlopen error [Errno -3] Temporary failure in name resolution>*

I have checked my dns with mxtoolbox and its resolving to server public ip address as expected.

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