Delphi Connection Closed Gracefully Error
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For more information about the Indy Project visit the Indy Project Page Advertising 19 Visitors Online Connection Closed Gracefully Author: Chad Z. Hower Homepage: http://www.atozedsoftware.com Many Indy users are annoyed by the EIdConnClosedGracefully exception that is raised with Indy servers, especially the HTTP and other servers. EIdConnClosedGracefully is an exception signaling that connection closed gracefully indy delphi the connection has been closed by the other side intentionally. This is not the same
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as a broken connection which would cause a connection reset error. If the other side has closed the connection and the socket is connection closed gracefully sendmail read or written to, EIdConnClosedGracefullywill be raised by Indy. This is similar to attempting to read or write to a file that has been closed without your knowledge. In some cases this is a true exception and your connection closed gracefully hatası code needs to handle it. In other cases (typically servers) this is a normal part of the functioning of the protocol and Indy handles this exception for you. Even though Indy catches it, when running in the IDE the debugger will be triggered first. You can simply press F9 to continue and Indy will handle the exception, but the constant stopping during debugging can be quite annoying. In the cases where Indy catches the exception, your
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users will never see an exception in your program unless it is run from the IDE. Simple solution Because the EIdConnClosedGracefullyis a common exception especially with certain servers it descends from EIdSilentException. On the Language Exceptions tab of Debugger Options (Tools Menu) you can add EIdSilentException to the list of exceptions to ignore. After this is added the exceptions will still occur in the code and be handled, but the debugger will not stop the program to debug them. Is it an error? All exceptions are not errors. Many developers have been taught or assumed that all exceptions are errors. However this is not the case, and this is why they are called exceptions and not errors. Exceptions are exactly that - exceptions. Delphiand C++ Builder use exceptions to handle errors in an elegant way. However exceptions have other uses besides errors as well. EAbort is one example of an exception that is not necessarily an error. Exceptions such as these are used to modify standard program flow and communicate information to a higher calling level where they are trapped. Indy uses exceptions in such a way as well. Why is it an exception? Many users have commented that maybe it there should be a return value to signal this condition instead of an exception. However this is the wrong approach in this case. The EIdConnClosedGra
execution and Indy will catch and handle the exception. http://www.swissdelphicenter.ch/en/showarticle.php?id=1 For Clients The server side of this connection has disconnected normally but your client has attempted to read or write to the connection. You http://www.indyproject.org/kb/whydoikeepgettingeidconnc.htm should trap this error using a try..except or in C++ Builder, a try..catch block. There is more detail about the EIdConnClosedGracefully exception in an article at the Indy Portal titled Connection Closed Gracefully. Please also see the help file for possible further information. See also: •Why does Indy raise exceptions as part of its normal operation?•Why do I get 10038 exceptions raised when I shut down my servers?
users that receive it, otherwise the error report is rather vague - if the disconnect (Connection closed gracefully) occurs right after the MAIL FROM then it might indicate a server policy rejecting an email with the domain which https://recalll.co/app/?q=Delphi%20+%20Indy:%20Connection%20closed%20gracefully it doesn't host as explained by Toni as well. Otherwise the "Connection closed gracefully" error means that an attempt is being made to read/write to socket that has been closed by the peer intentionally - in your case, peer is the SMTP server you connect to. It is different than the "Connection reset" error which indicates a broken connection. In both cases, the connection is no longer present and you can't read/write anymore to it. Delphi + Indy: Connection connection closed closed gracefully - Stack Overflow View More at http://stackoverflow.com/questions/1085933/delphi-indy-connection... EIdConnClosedGracefully is an exception signaling that the connection has been closed by the other side intentionally. This is not the same as a broken connection which would cause a connection reset error. If the other side has closed the connection and the socket is read or written to, EIdConnClosedGracefully will be raised by Indy. This is similar to attempting to read or write to a file that has been closed without connection closed gracefully your knowledge. In some cases this is a true exception and your code needs to handle it. In other cases (typically servers) this is a normal part of the functioning of the protocol and Indy handles this exception for you. Even though Indy catches it, when running in the IDE the debugger will be triggered first. You can simply press F9 to continue and Indy will handle the exception, but the constant stopping during debugging can be quite annoying. In the cases where Indy catches the exception, your users will never see an exception in your program unless it is run from the IDE. The exception doesn't occur in the IDE, but on end-user computers. Some virusscanners block outgoing connections on the SMTP port nowadays. This may cause the connection to be unresponsive and throw this error. @Atlas: That is why it says "In some cases..." :) The page also talks about the other cases. The server could also be disconnecting the connection on its end if any error is detected in the message data or sender/recipient addresses as well. Delphi + Indy: Connection closed gracefully - Stack Overflow View More at http://stackoverflow.com/questions/1085933/delphi-indy-connection... In my case the error was caused because I used a sender email address from a different domain than the one hosted by the smtp server, that's why the smtp server rejected the connection. Delphi + Indy: Connection closed gracefully - Stack Ov