Subject Re: [firebird-support] Error -902 after Update Windows 10
Author Helen Borrie
Eduard Calveras wrote:

> Since few days ago, after Windows 10 update, some applications
> writes in Delphi can not connect to network  Firebird 2.5.5 server.
> These applications can connect with BDE, InterBase, FIB, FireDac... but all are using the GDS32.dll

> In other side, applications as FlameRobin, are using the same
> library GDS32.dll and connects successfully.
> Clients with previous Windows versions works fine too.

> These are the errors messages: Interbase:

> 22/05/2018 17:48:03  DBUG:  ; ¬[Application: ]¬[Error]
> -902 335544721 Unable to complete network request to host
> "".¬Failed to establish a connection

> BDE:

> OpenConfigDatabase DbConnection Exception. Error Opening
> Configured Database $AUTO_DATA, Error was: Unknown database.
> Unable to complete network request to host "".
> Failed to establish a connection.

> The problem is a kind of local issue, because other Pc-clients
> works fine. But certainly is the gds32.dll that cannot connect
> with server and I not known why.

Last week, Martijn Tonies found this blog, which helped some people
with this problem:
Could this be related to:

"This means that applications started from these environments can’t open a
connection to a database server."

From the forensics (sketchy as they are!) it appears that, if your
network was using Homegroup for file sharing, then SMB would have been
already disabled *before* the update. The Fall Creators' Update has
removed Homegroup file sharing from Win 10 completely:

If your network is relying on a Homegroup for sharing files, there is
nothing you can do to fix this, as it is gone forever.

Meanwhile, of course, your Win 10 clients are left without file
sharing until SMB is (re-)enabled.

Go to
Control Panel
Programs and Features
Turn Windows features On or Off

and check on 'SMB 1.0/CIFS file sharing support'.

How Microsoft lights up our lives!