Provision of a Plesk based subscription failed with the following error in
Action Log under
Top > Configuration Director > Logging and Errors > Action Log:
Process provisioning for document; Cannot set(provision) settings of pdomain '<domain.tld>' to Plesk: Could not connect to Plesk Agent host or respone is empty. See Problem # p2016-01-29 13-12-11 for details.
From the detailed report in Problem Viewer:
[2016/01/29 13:12:11] [DEBUG]  [HSPC::MT::Plesk::PleskGate::__send_request_to_agent] REPLY_DATA=<script></script><p>ERROR: Class 'Mail_Server_GreyList_Manager' not found (Mail.php:436)<br><br><a href='https://kb.parallels.com/plesk-error/search?metaId=dd17ff48977ffbc1119670505220e598&messageId=28857ecb9a2696765c20260363d8889d&file=Mail.php&line=436&type=Error&message=Class+%22Mail_Server_GreyList_Manager%22+not+found' target='_blank'>Search for related Knowledge Base articles</a></p> [2016/01/29 13:12:11] [INFO]  [HSPC::MT::Plesk::PleskGate::__send_request_to_agent] Failed to parse response::1: parser error : Extra content at the end of the document <script></script><p>ERROR: Class 'Mail_Server_GreyList_Manager' not found (Mail.
The node for the subscription's provisioning is Plesk 11.5 on Windows.
Plesk related issue which affects Plesk 11.5 nodes based on Windows systems.
Please download the hotfixes and replace files on Plesk node: