Update applet malfunction after sources file modified

[Barry Yu]

1. Before modified (default) - Update applet round red button with white 
exclamation mark, clicked on it I can see there are 13  updates 
available (This number differs from the new ftp source that I use 
later).  I didn't do the update and proceed to modify the 
/etc/sysconfig/rhn/sources.
2. Per Alexander's "The up2date way" in his article "update problem",  I 
modified the /etc/sysconfig/rhn/sources and then log out x window, and 
log in again, here are what happen;

2.1- The blue applet button with white check mark final tells me that 
there are no update available ( In fact there were 13 reported before I 
modified the /etc/sysconfig/rhn/sources).
2.2 - I clicked on the applet to bring up the " Red Hat Network Alert 
Notification Tool" window,  there is a tab "Critical information" and 
the message is " The applet has been unable to access the information 
sources in its last attempts", but I ignored this warning and continued 
to try the rest of the update process by clicking on the "Launch 
up2date" "Forward" "Forward", there were  12 updates listed ( Not 13 as 
before sources file modification ), I checked to select them all and the 
update download speed more than 150k/s - excellent, installation  went 
well and finally completed without error ( at least not that I have seen ).

2.3  The modified /etc/sysconfig/rhn/sources;
#yum fedora-core-1 
http://download.fedora.redhat.com/pub/fedora/linux/core/1/$ARCH/os/
#yum updates-released 
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/1/$ARCH/
#yum updates-testing http://fedora.redhat.com/updates/testing/fedora-core-1
( Above are original line that I put "#" in front of each lines, below 
are the lines of new update source)
yum limestone-fedora-core-1 ftp://limestone.uoregon.edu/fedora/1/i386/os/
yum limestone-updates-released 
ftp://limestone.uoregon.edu/fedora/updates/1/i386/
#yum limestone-updates-testing 
ftp://limestone.uoregon.edu/fedora/updates/testing/1/i386/
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Conclusion:
After I have selected a new update source and put it into the 
/etc/sysconfig/rhn/sources file by modification, the  update applet 
can't reflect existing available updates but indicating no updates are 
available,  and seems having connection problem with this new update 
source at beginning, however it will complete all the available download 
nicely later - although the number of updates are not the same as 
original reported before the modification.
What have I missed out or done wrong during the modification?
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