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Virtual PC (Mac)

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VPC 6.1, OS X 10.3.9, Windows 98 and telnet

Source: microsoft.public.mac.virtualpc
Sent: 05/11/2005
From: (email address - cut out)
Message:

I have a new, obscure and confounding problem with VPC. Although my
environment and the issue at hand is probably rare, I'm hoping someone
here might have some insight:

I've been using VPC with Windows 98 since day one of OS X (and before).
My most-used Windows application is a host-specific terminal emulator
(specifically, Avaya's Site Administration ["ASA"] for managing its PBX
and voice mail products). I use Cisco's Mac VPN client to connect to a
corporate network across the Internet and then telnet from within ASA
to any of several Avaya PBXs. I use Windows 98 because it is much less
bloated than later Windows releases and, therefore, performs better for
my limited uses. BTW, VPC is set up with shared networking.

This setup has always worked beautifully, and fast. But after I updated
to OS X 10.3.9 around April 15 (no other concurrent changes
whatsoever), I started experiencing significant delays displaying
incoming ascii data within ASA's terminal window. The data flow would
often stop completely for anywhere from 10 seconds to as much as two
minutes or more, and then resume with no lost characters. Occasionally,
data would stop and never resume, but this was less common. Logging in
to the target PBX from another avenue would show that as far as the PBX
was concerned, it was done sending the requested screen of information.
So, clearly, the data was being buffered somewhere between the PBX and
ASA.

At first, the Cisco VPN client or something in the corporate LAN/WAN
infrastructure was suspected as the cause. But I have been able to
eliminate those possible causes by installing PowerTerm, a Mac-specific
generic terminal emulator. PowerTerm performs like lightening with the
same VPN/telnet connection; never any pauses whatsoever. So the issue
has to be somewhere between OS X 10.3.9 and VPC.

Has anyone else seen this, or is anyone in a position to try it out
with their setup? Can anyone tell me if updating to VPC 7.0 might solve
the problem?

Any help or advice would be greatly appreciated.

Brian Shaw

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Related Messages

Re: VPC 6.1, OS X 10.3.9, Windows 98 and telnet

Sent: 05/13/2005
From: "Paul Power" <(email address - cut out)>
Message:

Brian,

Have you tried removing to 10.3.9 update? If not, try that first to see
if the update is actually causing this problem?

Re: VPC 6.1, OS X 10.3.9, Windows 98 and telnet

Sent: 05/17/2005
From: (email address - cut out)
Message:

Paul Power wrote:
see

No, Paul, I have not. Since I posted my question, I have installed
Tiger and the problem persists. I then (yesterday) installed the brand
new Cisco VPM client that is Tiger compatible, but the problem
persists.

I have also given PowerTerm for the Mac a try and its performance is
like lightning! No issues. So it has to be between OS X 10.3.9 and 10.4
and VPC.

I'd like to think that VPC 7.0 would fix the problem but, as we all
know, 7.0 is not compatible with Tiger (Virtual Switch doesn't work,
and I need that for VPN!).

Catch 22.

Show quoted text

> Brian,
>
> Have you tried removing to 10.3.9 update? If not, try that first to
> if the update is actually causing this problem?

Re: VPC 6.1, OS X 10.3.9, Windows 98 and telnet

Sent: 05/20/2005
From: (email address - cut out)
Message:

Since I first posted my message, I have made a lot of changes, included
the purchase and install of VPC 7.01, the installation of Tiger and the
installation of Cisco's Tiger-compatible VPN client.

The problem persists. HOWEVER, in case Microsoft monitors this forum,
it appears that if I restart the virtual machine, things work perfectly
until I quit VPC and, in the process, save the PC's state. Restarting
with the saved image seems to cause the problem to crop back up. I'll
be doing more testing to confirm, but as everyone knows, restarting a
virtual machine is very time consuming, especially when you're trying
to get some work done. I've got work to do.

Re: VPC 6.1, OS X 10.3.9, Windows 98 and telnet

Sent: 05/20/2005
From: "Paul Power" <(email address - cut out)>
Message:

An "educated" guess here would be Virtual Switch Networking.

However, you are up against a couple of strikes:

1. Virtual Switch Networking does not work with Tiger as yet.
2. You are using Windows 98, which is not supported within VPC by
Microsoft

I sure do wish that you could (or would) roll back to 10.3.9 and change
over to Virtual Switch Networking. I'm almost positive that is the root
cause of this issue

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