Symptoms

The server closed the client connection because it was stalled for longer than the nsslapd-ioblocktimeout attribute value. This code can occur for the following reasons: There is a network problem. The server sends a lot of data to the client but the client does not read the data. As a result, the server’s transmit buffer becomes full. I have that message psycopg2.OperationalError: server closed the connection unexpectedly from time to time. My installation uses a simple docker-compose file, no docker swarm at all. Using version docker-zulip:2.1.7-0 Sometimes I can get 10 messages a day, then weeks without even one. Any ideas what could be the reason? This kind of issue may take place when a time-out value is set too low on the server or connected network device. To resolve this issue, see resolutions A, D, E, F, and O. This issue can also occur if the server makes the connection reset unpredictably, such as if an uncontrolled exception crashes the server function.

Consider the scenario where you have Outlook or other MAPI applications that connect to Exchange Server 2010 through a hardware load balancer or other network device. The application also requires long running TCP connections to function as expected. If the network device closes idle connections via a timeout setting, the MAPI application fails to complete requests over the connection.
If the application is Outlook, you may see the following events in the Application event log of the client computer:

Log Name: Application
Source: Outlook
Event ID: 25
Task Category: None
Level: Information
Keywords: Classic
User: N/A
Computer: Computer.contoso.com
Description:Could not perform the desired operation. The selected command is not valid for this recipient. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.

Log Name: Application
Source: Outlook
Event ID: 26
Task Category: None
Level: Information
Keywords: Classic
User: N/A
Computer: Computer.contoso.com
Description:Connection to Microsoft Exchange has been restored.

Cause

A configuration for a hardware load balancer, or other network device such as a firewall or proxy, is causing client connections to drop. When the device closes idle connections, via timeout or other configuration, the application fails to complete subsequent requests over the connection that was closed.

Resolution

To resolve this issue, consider the following solutions:

Verify the configuration of the network device, per the vendor recommendations or through contacting the Technical Support team for the vendor. This may require increasing the timeout on the network device so that long running connections are not prematurely closed.
For an application server connecting to Exchange Server 2010, set the application server's TCP Keep-Alive time to a value less than the idle connection timeout window on the network device.
For example, if the idle connection time out on the device is 15 minutes, set the TCP Keep-Alive on the application server to a value less than 15 minutes. Free barbie dress up games download for pc.

Ford ids v86 patch system. Easyworship 7 offline license file download. By default the TCP Keep-Alive time is 2 hours and disabled. To adjust the TCP Keep-Alive time on an application server see the following article from the Microsoft Knowledge Base:

324270 How to harden the TCP/IP stack against denial of service attacks in Windows Server 2003It is important to stress that the connections in question are typically internal RPC connections for Outlook clients in Online mode, rather than RPC over HTTP/Outlook Anywhere connection. Frequently, issues such as this occur due to session timeouts, network configuration, optimization configuration or other features on the network device that require modification.
In many cases, session timeout settings are typically too low. In discussion with network device vendors, it is frequently recommended that RPC timeout settings should be 120 minutes, at a minimum.

More Information

Server Closed Connection

Both of the solutions above may prevent the TCP connection from timing out prematurely.
Note A frequently used test to determine whether a device configuration is at issue is to bypass the device. This is done by using a Hosts file on the client or a DNS record to access a single CAS server in the array. However, if the device is also used as a gateway, this may not provide accurate results.
For additional information on long running connections, see section 4.2.3.6, TCP Keep-Alives, from the following Internet Engineering Task Force document:

RFC 122 - Requirements for Internet Hosts - Communication Layers
http://datatracker.ietf.org/doc/rfc1122/
For additional information on Load Balancing for Exchange Server 2010, see the following presentation from TechEd 2011

Load Balancing with Microsoft Exchange Server 2010
http://channel9.msdn.com/Events/TechEd/NorthAmerica/2011/EXL307

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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

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..

Transmit Server Closed Connection

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.

Transmit Server Closed Connection.