Pull subscription and ISA server

Hi
Can anyone point me in the right direction, I am trying to do an anonymous
pull subscription across the internet. I have created a publisher and created
the snapshot ok. On the subscriber server I can FTP by IP ( the ISA servers
external IP address ) or by the servers name and can see the folders created
in the repldata\ftp directory. I can create a new SQL server registration on
the subscription server and get a connection into the publisher, I can run
sql queries against the publisher ok.
When I try and create a pull subscription, I get to the last page on the
wizard and get
SQL Server enterprise Edition could not create a pull subscription to
publication 'MyDB'
Error 21776: [SQL-DMO] The name 'MyDB' was not found in the TransPublications
collection
Any help greatly appreciated
Having reinstalled and rebooted several times yesterday I was getting nowhere
hence my post in this NG
Come back to it today and the pull subscription worked first time without
any errors on yesterdays configuration. Wierd ?
Anyway, if any one can shed any light on what was going on when it was
failing, please let me know.
thanks