Dell SonicWall SRA 4200 Administrator's Manual page 32

If the AD authentication times out, the Setup could not finish message is displayed. Wait about
Step 10
20 seconds and try again. You can also check the SRA log to see if the user logged in successfully.
You may not encounter this problem if the AD authentication is fast.
When the authentication finishes, a security warning appears. Click OK to continue, modify
Step 11
your account settings, and click Next.
Try to send and receive emails, and ensure that ActiveSync entries are included in the SRA log.
Step 12
32 | SRA 6.0 Administrator's Guide