[Info-vax] SFTP hang - from VMS to Windows

[Stephen Hoffman]

On 2013-02-25 15:19:32 +0000, GerMarsh said:

> Thank you for the comments and pointers. It is indeed an FTP connection 
> which kicks the SFTP transfer back into life and the FTP is initiated 
> from Windows.
> 
> I reckon that this fact indicates that this is not a VMS SFTP client 
> issue at all.

Guesses made while debugging are reasonable, particularly when you 
subsequently test and verify then.

Unverified assumptions are rather less valuable, and can delay the 
resolution should they prove incorrect.

> I discovered that the SFTP transfers worked consistently and much 
> faster when the VMS and Windows boxes were in the same building. The 
> Windows box has now been relocated a hundred miles or so!

It could well be the connection delays, packet loss, controller duplex 
settings, misconfigured network firewalls and gateways, or various 
other such widgets.

FWIW, ftp isn't particularly compatible with firewall-gateway boxes; 
those that can't inspect the innards of the ftp connection traffic and 
then react appropriately to the data connection.


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