Hey Stanley, were you able to resolve this? I’ve got similar issues and no answer yet. https://www.wpdownloadmanager.com/support/topic/amazon-s3-upload-problem/
[Fri Jun 28 15:23:47.470826 2019] [fcgid:warn] [pid 23574] [client 172.69.234.142:33526] mod_fcgid: stderr: PHP Fatal error: Uncaught exception ‘Aws\\S3\\Exception\\S3Exception’ with message ‘Error executing “ListObjects” on “https://ourbucketname.s3.undefined.amazonaws.com/?prefix=uploads%2F&encoding-type=url”; AWS HTTP error: cURL error 6: Could not resolve host: ourbucketname.s3.undefined.amazonaws.com (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)’, referer: https://our.website.com/wp-admin/edit.php?post_type=wpdmpro&page=wpdm-aws
[Fri Jun 28 15:23:47.470922 2019] [fcgid:warn] [pid 23574] [client 172.69.234.142:33526] mod_fcgid: stderr: exception ‘GuzzleHttp\\Exception\\ConnectException’ with message ‘cURL error 6: Could not resolve host: ourbucketname.s3.undefined.amazonaws.com (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)’ in /home/website-owner/domains/our.website.com/public_html/wp-content/plugins/wpdm-amazon-s3/aws-sdk/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php:185, referer: https://our.website.com/wp-admin/edit.php?post_type=wpdmpro&page=wpdm-aws
[Fri Jun 28 15:23:47.470931 2019] [fcgid:warn] [pid 23574] [client 172.69.234.142:33526] mod_fcgid: stderr: Stack trace:, referer: https://our.website.com/wp-admin/edit.php?post_type=wpdmpro&page=wpdm-aws
[Fri Jun 28 15:23:47.470937 2019] [fcgid:warn] [pid 23574] [client 172.69.234.142:33526] mod_fcgid: stderr: #0 /home/website-owner/domains/our.website.com/public_html/wp-content/plugins/wpdm-amazon-s3/aws-sdk/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php(149): GuzzleHttp\\Handler\\CurlFactory::createRejection(Object(GuzzleHttp\\Handler\\EasyHandle), Array), referer: https://our.website.com/wp-admin/edit.php?post_type=wpdmpro&page=wpdm-aws
[Fri Jun 28 15:23:47.470943 2019] [fcgid:warn] [pid 23574] [client 172.69.234.142:33526] mod_fcgid: stderr: #1 /home/jimhighto in /home/website-owner/domains/our.website.com/public_html/wp-content/plugins/wpdm-amazon-s3/aws-sdk/vendor/aws/aws-sdk-php/src/WrappedHttpHandler.php on line 191, referer: https://our.website.com/wp-admin/edit.php?post_type=wpdmpro&page=wpdm-aws
[Fri Jun 28 15:23:51.195892 2019] [fcgid:warn] [pid 23579] [client 172.69.234.142:41866] mod_fcgid: stderr: PHP Fatal error: Uncaught exception ‘Aws\\S3\\Exception\\S3Exception’ with message ‘Error executing “ListObjects” on “https://ourbucketname.s3.undefined.amazonaws.com/?prefix=uploads%2F&encoding-type=url”; AWS HTTP error: cURL error 6: Could not resolve host: ourbucketname.s3.undefined.amazonaws.com (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)’, referer: https://our.website.com/wp-admin/edit.php?post_type=wpdmpro&page=wpdm-aws
[Fri Jun 28 15:23:51.195953 2019] [fcgid:warn] [pid 23579] [client 172.69.234.142:41866] mod_fcgid: stderr: exception ‘GuzzleHttp\\Exception\\ConnectException’ with message ‘cURL error 6: Could not resolve host: ourbucketname.s3.undefined.amazonaws.com (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)’ in /home/website-owner/domains/our.website.com/public_html/wp-content/plugins/wpdm-amazon-s3/aws-sdk/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php:185, referer: https://our.website.com/wp-admin/edit.php?post_type=wpdmpro&page=wpdm-aws
[Fri Jun 28 15:23:51.195961 2019] [fcgid:warn] [pid 23579] [client 172.69.234.142:41866] mod_fcgid: stderr: Stack trace:, referer: https://our.website.com/wp-admin/edit.php?post_type=wpdmpro&page=wpdm-aws
[Fri Jun 28 15:23:51.196011 2019] [fcgid:warn] [pid 23579] [client 172.69.234.142:41866] mod_fcgid: stderr: #0 /home/website-owner/domains/our.website.com/public_html/wp-content/plugins/wpdm-amazon-s3/aws-sdk/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php(149): GuzzleHttp\\Handler\\CurlFactory::createRejection(Object(GuzzleHttp\\Handler\\EasyHandle), Array), referer: https://our.website.com/wp-admin/edit.php?post_type=wpdmpro&page=wpdm-aws
[Fri Jun 28 15:23:51.196021 2019] [fcgid:warn] [pid 23579] [client 172.69.234.142:41866] mod_fcgid: stderr: #1 /home/jimhighto in /home/website-owner/domains/our.website.com/public_html/wp-content/plugins/wpdm-amazon-s3/aws-sdk/vendor/aws/aws-sdk-php/src/WrappedHttpHandler.php on line 191, referer: https://our.website.com/wp-admin/edit.php?post_type=wpdmpro&page=wpdm-aws