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Issue Plesk operations with cURL fail

C

Chris Dempsey

New Pleskian
Plesk Backup Manager is configured to store backups on Amazon S3 and successfully ran daily since the server was created around 2 weeks ago.

Environment details

Plesk Obsidian v18.0.32_build20201221.13 os_Windows 2012/2016/2019
Microsoft Windows 10.0;build-14393;sp0.0;suite272;product3

On login Plesk showed error alerts

Code: 
Unable to create remote backup, the local backup will be created. Error: Unable to export backup: Transport error: Extension transport: ext://s3-backup/server/: Error executing "PutObject" on "https://mybucket.s3.us-west-2.amazonaws.com/backups/plesk/system/"; AWS HTTP error: cURL error 6: Could not resolve host: mybucket.s3.us-west-2.amazonaws.com (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)

On viewing Backup Manager the following error alerts are shown

Code: 
Warning: Could not display the list of backups in the Amazon S3 Backup storage: Unable to get dumps list: Transport error: Extension transport: ext://s3-backup/server: Error executing "ListObjects" on "https://mybucket.s3.us-west-2.amazonaws.com/?prefix=backups%2Fplesk%2Fsystem%2F&delimiter=%2F&encoding-type=url"; AWS HTTP error: cURL error 6: Could not resolve host: mybucket.s3.us-west-2.amazonaws.com (see http://curl.haxx.se/libcurl/c/libcurl-errors.html). Please check the storage settings.

Code: 
Warning: Unable to upload a file to the storage: Error executing "CreateMultipartUpload" on "https://mybucket.s3.us-west-2.amazonaws.com/backups/plesk/system/test-0f818b6a1aa414175c58e2e07d42db8f?uploads"; AWS HTTP error: cURL error 6: Could not resolve host: mybucket.s3.us-west-2.amazonaws.com (see http://curl.haxx.se/libcurl/c/libcurl-errors.html). Make sure you have granted the permission for multipart upload of files.

I notice the host Plesk looks for is: mybucket.s3.us-west-2.amazonaws.com however my bucket is stored in eu-west-2. I am not sure this matters though as I can connect to the bucket with the Key and Secret in FileZilla without specifying the region.

Updating the Remote Storage Settings with the same Key and Secret returns error

Code: 
Error: Error executing "HeadObject" on "https://ds-skye.s3.us-west-2.amazonaws.com/backups/plesk/system/"; AWS HTTP error: cURL error 6: Could not resolve host: mybucket.s3.us-west-2.amazonaws.com (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)

The Plesk Dashborard Home page reports another error

Code: 
Error: Failed to update the ModSecurity rule set.

To further test cURL from Plesk I updated a Let's Encrypt Certificate, this returned error

Code: 
Error: Could not issue a Let's Encrypt SSL/TLS certificate for mydomain.co.uk.


    Failed to connect to the Let's Encrypt server https://acme-v02.api.letsencrypt.org.
    Please try again later or report the issue to support.
    Details
    Could not obtain directory: cURL error 6: Could not resolve host: acme-v02.api.letsencrypt.org (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)

So this looks very much like Plesk cURL is broken or misconfigured.

Next I created a simple php script to test cURL. It fails to fetch content from a text file on a remote server but successfully fetches content from a local domain (the hosts file maps the domain to the local server IP).

Can anyone suggest what the cause might be or how I can investigate further?

There is a similar error linked below but this doesn't help as it's related to Plesk Linux

Issue - cURL error

In the last two weeks I have been getting the following errors AWS HTTP error: cURL error 6: Could not resolve host - Unknown error (see libcurl - Error Codes) AWS HTTP error: cURL error 52: Empty reply from server (see libcurl - Error Codes) I use the Amazon S3 Backup Extension but it...
talk.plesk.com talk.plesk.com

Thanks,

Chris
 
It looks like your server does not resolve external domain names correctly. Have you checked that the name servers entered in /etc/resolv.conf can be reached? Have you tried to do a manual name resolution like
# dig acme-v02.api.letsencrypt.org +short
# nslookup acme-v02.api.letsencrypt.org
# ping acme-v02.api.letsencrypt.org
 
It's a Windows machine so I don't have DIG but you are correct.

I can reach
Code: 
https://ds-skye.s3.us-west-2.amazonaws.com/backups/plesk/system/
from my local machine in the browser but not in a browser on the server over RDP.

It seems
Code: 
Windows can't communicate with the device or resource (primary DNS server)
.

I have referred this back to Engineers at the data centre, I'm unsure how to resolve myself.

Thanks Peter
 
Turns out it was a network configuration error.

Unsure what caused it as the machine was stable in that sense since it was built two weeks ago until today.
 
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