Resolver failure on VRPC on the Mac

Tim Powys-Lybbe tim at
Mon Apr 14 21:00:16 BST 2014

On 14 Apr at 15:05, Rob Kendrick <rjek at> wrote:

> On Mon, Apr 14, 2014 at 02:48:27PM +0100, Tim Powys-Lybbe wrote:
> > > 
> > > I would be happy to try any diagnostics that might help pin this
> > > down.
> > 
> > And I offer the same.
> Perhaps if there is an OS X box running VRPC at Wakefield, we'll be
> able to look.

Regrettably I cannot assist as me and my portable Mac OS Box will be out
of the country.

But if nothing else is available, I could subsequently bring mine over
to a knowledgeable person who lives within 50 miles of Windsor.

> But my understanding is that VRPC uses an egregious
> hack for its networking (proxying SWIs, where RPCemu provides an
> emulated NIC that the host routers), which could cause all sorts of
> excitement given NetSurf does its own resolving, and uses the
> environment variable that tells it which server to use, which may not
> exist or may change if NetSurf queries it before the networking on the
> OS X side has finished connecting, or if there's some race in the VRPC
> hack.
> Basically, there are hundreds of possibilities, and it's not going to
> be easy to work it out without physical access.
> Perhaps VirtualAcorn would be interested in loaning a copy of their
> software to a developer with access to OS X?  (I don't.)
> Alternatively, does anybody know if the same issues happens with
> RPCemu under OS X?

Only a week ago I gave RPCEmu another thrash under OS X.  But I got
nowhere as networking is not available for this emulation (see
<>) and also nothing I did would port any
RISC OS software to that emulator.

Tim Powys-Lybbe                                           tim at
             for a miscellany of bygones:

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