one suggestion I have seen on the yum web site is problems with proxy servers and that I should type the following:
Q. 5: I get an "[Errno -1] Header is not complete." error from yum - what the heck is going on?
A. It's probably a proxy somewhere between you and the repository. You may not think that a proxy is in the way even though it really is.
You can try doing a "trace" with this command:
echo -e "TRACE / HTTP/1.1\nHost: yum-server.example.com\n\n" | nc yum-server.example.com 80
Which should give you some more information about the network between you and the repository. Also, be sure to replace yum-server.example.com with whatever your yum repository server is.
but does not explain what I should see come back....
also have read that I could copy the updates to the server and do a local install/update/modify - is there any notes on this / guides?
Thanks