On 03/15/2012 09:54 PM, Curt Broyles wrote:
Problem:
We provide medical billing for a doctors office across the state. In order
to access his patient medical system, his IT company installed Shrew Soft on
all our PC's. We connect to their office via Access Manager, and once
connected we open their patient medical software with a client they also
installed on our PC's. For some time all was working find then suddenly we
started having the following problem.
The first person can connect and work fine. Once a second person makes a
VPN connection from our office the first person's connection will freeze up
and the only way the PC can recover is to reboot. Even if the second person
closes the VPN connection, the first person to make the connection cannot
recover.
To Reproduce:
VPN Client Version = 2.1.7
Windows OS Version = Windows XP SP Latest Updates
Gateway: Sonicwall TZ180
Gateway OS: Sonicwall Standard 3.8.0.1-27s
Hi Curt,
You mention that it was working for a while, then the problems began.
That obviously suggests something changed on the path. I'd first look
to firewalls/gateways in the path.
What about at your local site? Do you have a firewall protecting the
office? Has it recently had an upgrade or changes made to it? Perhaps
it needs IPsec passthrough re-enabled to handle multiple IPsec clients
behind it.
The symptom of Shrew locking up the PC sounds a little like a condition
I've seen where one of the Shrew processes (iked.exe or ipsecx.exe) take
full control of the CPU and very reluctantly releases it. For me this
has happened when I've briefly lost my wifi connection. My guess is
that Shrew gets some unexpected packets and get horribly confused.
If this is what's happening with you, then I'd look for a local problem,
like your firewall is mixing up or dropping some of the ipsec packets
for your multiple Shrew clients.
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