access to snapshot folder

Hi All,

Am working on a transactional replication between different domains (say A and B). My plan is to create pull subscription with all agents running in distributor(here distributor and subscriber are same). I place the snapshot folder in domain B and gave access to domain account to that folder which also runs the snapshot agent. When I started the snapshot agent I got the error 'snapshot agent could not access the folder', 
Step -1 -> I unchecked the default folder and gave a named new share folder which located is in same domain B.In this situation also I got a message 'XXX is not a valid path, or it refers to a file instead of a folder. Enter the path to an existing folder'before giving ok.
step -2 -> Hence I checked if the folder can be accessed from publisher using the snapshot agent credentials, which is a success.. after this testing I again did the step 1 now this also succeed.

Now, it's working fine. But wondering how this credential/permissions testing I did in my Step-2 resolved the issue. as I got a error message 'XXX is not a valid path, or it refers to a file instead of a folder. Enter the path to an existing folder' at first and when I did the credential/permissions testing it resolved it.
Please explain why?

Best Regards,
Mughilan

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Best Regards Moug