On 16-5-2018 02:54, Helen Borrie helebor@... [firebird-support]
wrote:

> foros@... wrote:
>
>> Hi
>
>> Since few hours ago, in some customers after Windows 10 update, my app can not connect to server.
>
>> Fb server works, and clients with previous Windows versions work.
>
>> Error; 8004 - Unable to complete server request to host...
>
> As far as I can see, error 8004 is a serial port error, not a network
> one. It's strange that Windows accompanies it with a network error
> message (unless, perhaps. those machines have a serial controller for
> the network card...???)

According to
https://msdn.microsoft.com/en-us/library/windows/desktop/ms681389(v=vs.85).aspx,
error 8004 is

"""
FRS_ERR_INTERNAL_API

8004 (0x1F44)

The file replication service API terminated the request. The event
log may have more information.
"""

Which might suggest the OP is possibly opening a database through a
share, or maybe this is WNET related?

Mark
--
Mark Rotteveel