PostgreSQL Error: server closed the connection unexpectedly. Ask Question Asked 7 years, 5 months ago. Active 4 months ago. Viewed 53k times 1. I cannot connect to. The resolution to this issue, after opening a case with Microsoft support, was to install and run SSLDiag and verify that there is an issue with the certificate that is generated automatically for the Office Server Web Service during the install of SharePoint. Once that is verified, install SelfSSL, remove the offending cert and create. Some Outlook users are reporting that they consistently get the 0x800CCCDD error (‘ Your IMAP server closed the connection ‘) whenever they send or receive emails via an IMAP account. This particular error code is signaling that the Send/Receive feature has failed. Outlook Error 0x800CCCDD with IMAP Server. Any HTTP client, server, or proxy can close a TCP transport connection at any time. The connections normally are closed at the end of a message18 but during error conditions, the connection may be closed in the middle of a header line or in other strange places. This situation is common with pipelined persistent connections. In the normal case, each side terminates its end of the connection by sending a special message with the FIN (finish) bit set. This message, sometimes called a FIN, serves as a connection termination request to the other device, while also possibly carrying data like a regular segment.
-->Server Closed Connection
This article helps you resolve the FTP download session fails problem that occurs when FTP control connection is closed.
Original product version: Internet Information Services
Original KB number: 254722
Symptoms
If the control connection is closed during an FTP download session, the download from the IIS FTP site fails.
Note
This issue usually occurs when a firewall is in use that has been set to close the control connection if no TCP data is transferred after a certain amount of time.
Cause
Transmit Server Closed Connection
This is by design. RFC-959 states the following:
... The protocol requires that the control connections be open while data transfer is in progress. It is the responsibility of the user to request the closing of the control connections when finished using the FTP service, while it is the server who takes the action. The server may abort data transfer if the control connections are closed without command...
Workaround
To resolve this issue, try the following workarounds:
- Use an FTP utility or firewall setting that keeps the control connection open.
- Use a faster connection.
- Request that the FTP Site owner break the file that the download fails on into multiple, smaller files.
More information
This scenario usually occurs when you are downloading a large file over a slow connection.