I had a client call me and provided the following info from the error
log after their scheduled backup stopped working:

12/19/2005 07:20:26 UseExternalTimer:  Unable to open timer file '\s1u0.',
                    errno=2,error:No such file or directory
12/19/2005 07:20:39 ANS1568E The CAD attempted to register it's tcpport
                    and tcpip address without using the TCPCADADDRESS option.
12/19/2005 07:20:39 ANS1570E Registering this instance of the Cad with the
                    server failed. Cad process continues.

Looking up message ANS1568E says to do the following:

Use TCPCADADDRESS in the client option file to indicate the proper TCP/IP
address for this CAD.

I had the client add this option and the error does not reoccur.  He
is asking if he will need to go into his DSM.OPT file and change this
whenever his IP address is renewed.  I told him to try his DNS entry.
I then attempted to look up this option in the client doc and cannot
find any documentation on this anywhere.

I suspect some kind of corruption somewhere along the line, since this
just happened out of the blue and also suggested he remove the client
and reinstall.

Client is 5.3.0.0, Server is 5.3.2.0.

Anyone have any experience with this and any info on the TCPCADADDRESS
option?

Thanks
Sam Sheppard
San Diego Data Processing Corp.
(858)-581-9668