Hello,

My current setup consists of 3 VMs in Hyper-V each running Windows Server 2016. One is just a domain controller, one runs Exchange 2016 (CU12), and the other is the SolidCP Enterprise/Portal server (installed with the standalone option). Whenever I attempt to create a new mailbox it sits at the Creating Mailbox popup for 15 or 20 minutes before saying that the operation has timed out, and to see the audit log for more details. So far this is only happening when creating a user mailbox; I can create mail enabled public folders with no problems, and even when making a new mailbox the associated user is created in active directory. The SCP event logs seem to be missing from the portal/enterprise server, but on the Exchange server I don’t see any entries in either the SolidCP or MSExchange Management logs after trying to create a new mailbox. I took a packet capture on the Exchange server, and in the HTTP stream I see the last thing I see is a post request coming from the enterprise server starting:

POST /ExchangeServer.asmx HTTP/1.1
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; MS Web Services Client Protocol 4.0.30319.42000)
SOAPAction: "http://smbsaas/solidcp/server/CreateMailEnableUser"

And after that there is no response from the Exchange server. Given the lack of information in the event log I’m not sure what exactly is going wrong, so any guidance or advice would be appreciated.