Hi, When an exception occurs in a function, SimpleXMLRPCServer currently sends exception type and value back to the client (in <faultString>) . So the client sees some thing like: "'<type \'exceptions.ValueError\'>:invalid literal for int() with base 10" This string is constructed in _marshaled_dispatch() as ""%s:%s" % (exc_type, exc_value)". How about adding the stack traceback to this string? I found it very useful to have the server side traceback in case of failures. I will come up with a patch if there is any interest. Some thing similar has been done in case of internal server errors (in r57158). Thanks, Raghu