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TElSimpleSFTPClient.Close takes long time to complete

Posted: 06/13/2013 14:11:17
by Alex Jenkins (Basic support level)
Joined: 06/13/2013
Posts: 2


I am using evaluation licence to assess suitability of SecureBlackboxSFTP .NET edition for a file transfer requirement between windows W7 and XP desktop clients and HPUX servers. My code uses TElSimpleSFTPClient object. When calling Close method on one of the servers (HP-UX 11.11) the operation takes 2 minutes to complete before the OnCloseConnection event handler fires - i'm guessing a timeout expiry eventually returns control to client.

The value of the 'silent' parameter makes no difference. The operation is scoped with a try / catch block no exception is raised, nor does the OnError event fire. The ServerCloseReason property is empty. This problem only happens on one of the two servers I can access for development, the other one returns from Close method promptly.

Any advice to resolve this show stopping issue much appreciated.


Posted: 06/13/2013 14:23:57
by Eugene Mayevski (Team)

There's a bug in some servers that prevents them from doing graceful shutdown (graceful = according to TCP rules).

In this case Silent = true should help but in SBB 10 it doesn't due to a bug (this bug has been fixed in SecureBlackbox 11).

The solution is to call Interrupt() method, then Close(true). Interrupt will forcefully close the underlying socket.

Sincerely yours
Eugene Mayevski
Posted: 06/14/2013 02:44:12
by Alex Jenkins (Basic support level)
Joined: 06/13/2013
Posts: 2


That does the trick. Very many thanks for such a quick response.

Best regards




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