Please describe how you are trying to get the images, and what version of Ghost Solution Suite you are using. The more information you can supply, the more likely it is that someone will have a solution.
Also look at the following threads which have possible solutions to the 19945 error (found by using the search option in the forum):
https://www-secure.symantec.com/connect/forums/error-503-ghostcode-19945-0
https://www-secure.symantec.com/connect/forums/connection-timed-out-ghost-code-19945
If you are using PCDOS as your boot environment and the image is greater than about 22Gb then it will fail as noted in the first link above.