IMAP connection works on iMac, not on MacBook

Hello,
I've been setting up Mail to access an IMAP account with a new web host. I set it up on my iMac without issue. It uses port 993 for an SSL connection, reads and sends mail with no problems. Trying to set it up on my MacBook Pro, using the same settings, and can't get it to work. Through Airport I was getting messages that it couldn't connect to the server, so I hooked it up to wired Ethernet, same as the iMac. It made the intiial connection, but now says it can't read data from the server, and the Activity window shows it endlessly trying to connect and sync. Both Macs running 10.6.7, and using Mail.app. Same firewall settings (it's on, with no services enabled in the Sharing preference), as I'm thinking maybe it's some kind of port issue. Any thoughts? Thanks.
Dan

Try copying the "com.apple.mail.plist" file from the working iMac's preferernces folder to the MacBook's. The file is located in User > Library > Preferences.

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Connect an ethernet cable from the MacBook to the iMac.
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IMAP connection works on iMac, not on MacBook

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