Experimental Physics and
Industrial Control System

"J. Lewis Muir" <[email protected]> · Wed, 13 Oct 2010 12:04:50 -0500

On 10/13/10 11:14 AM, Mark Rivers wrote:
> Folks,
> 
> We are having trouble with a Windows IOC at NSLS.  Here are the
> symptoms:
> 
> - The IOC is running fine
> 
> - The PC running the IOC has 2 local CA clients connected to the IOC,
> medm and IDL.  Occassionally (1-2 times per day) one of these clients
> loses its connection to the IOC.  Medm screens go white, IDL says it
> cannot find a PV, etc.  This happens when the client was running fine.
> It typically only happens to one or the other client, not to both.
> 
> - Restarting the client fixes the problem.
> 
> - The same 2 clients are running on another PC connected to the same
> IOC.  Those clients are always fine, they do not lose connection when a
> client on the PC with the IOC does.
> 
> - Looking at the resources on the Windows machine (CPU, virtual and
> physical memory usage) does not indicate any problems.
> 
> How do we go about figuring out what is wrong?

Hi, Mark.

Not a method for figuring out what's wrong, but some possible things you
might try or consider:

Windows Firewall?

Virus scan software?

BNL auditing software?

Automatic backup?

Is there anything in the Windows event logs?

Differences between OS or applications between the two computers?

Can you force the clients to use the loopback network device and see if
they still have the problem?

If you run camonitor against a PV from the local IOC, does it lose its
connection too?

Any error messages from the CA clients?

If you run a simple TCP/IP ASCII "echo" server and connect to it w/ a
TCP/IP client (e.g. Telnet), does that connection get terminated at the
same time as the CA clients?

Lewis

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System