Symptoms
"Upgrading resources of application 'Acronis Backup Cloud'" task fails with the following error:
Internal error: APSC: Upgrade to ver. 2.0-1277 : resource 37-...-d1 of type 'globals' (http://acronis.com/aps/cloud-backup-v1/globals/6.6) for APS application 'Acronis Backup Cloud-2.0-1277' :
Network error: No message received. Application endpoint: 10.2.3.28. Request: POST /backupservice/globals/37-...-d1/upgrade?version=2.0-1241..
Cause
Network connections limit was exceeded.
Acronis APS endpoint did not close connections with Acronis server.
Resolution
Add (or uncomment) the following code line:
$this->_curl->refresh();
to the execute($uri, $method, $requestBody, $authHeaders = NULL) function body in /var/www/html/backupservice/app/Service/BaseClient/RestTransport.php file on APS endpoint host.
This forces curl utility to close its connections.