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Hello

I just have a question, for constant and real-time monitoring about more than 8 thousand destination servers (all have different IP) through SSHShell connection, by which we can get the text message whenever there are alarm happening.

I have tried with SecureBridge v5.5.1/Delphi Xe2/Win7 64 professional, but it seems that for several SSH connections, this structure works fine, but if I have more than, let's say 1000 connection, then the OnAsynReceiveEvent was not fired.

Any recommendation on how to setup in this massive connection quantity case?

As a workaround, I have set NonBlocking to False, and use a timer, each 1 minute make a loop to each SSHShell component to make a ReadString call, and if the result is not empty, then display them.

But since use the NonBlocking mode, in case of "alarm-storm" then it is not a good solution, while for reaction to these alarm is also blocking.

Is OnAsynReceiveEvent is driven by thread or not?

To solve the problem try to increase the TScSSHClient.Timeout and TScSSHShell.Timeout properties, e.g. to 120 second.

The OnAsynReceiveEvent event is raised only when TScSSHShell.NonBlocking is True.

while reading the source code, seems that OnAsynRecevieEvent is fired as by a timer instead of I/O event.

Am I　right?

If so, then there will be 8 thousand timer be created. And I think this could be a problem root?

Is it possible that OnAsynReceiveEvent is fired by I/O instead of timer?

Set the TScSSHChannel.CallAsyncEventsInMainThread property to False for raising the OnAsyncError event in a secondary thread.
This property is availabled since SecureBridge version 6.4.6.