0xc0040396 Error When Joining EMS Array

Question

I am trying to migrate ISA 2006 Enterprise to TMG 2010 Enterprise.  I built the Windows 2008 R2 EMS server and successfully imported the configuration which I had exported from ISA (single server "array").  I then installed
TMG 2010 on my intended first array member, which is a Windows 2008 R2 server with the same name and IP address as the original ISA server.  The new server thus has a certificate with the same subject name as the one used by the old ISA server. 
I also imported a certificate which is used for an OWA publishing rule into the new server.
When I try to join this server to the array, it can connect to the EMS but it eventually fails with this error:
 "0xc0040396 SSL is enabled for the internal network.  You must specify a certificate to use for SSL authentication."
I'm not entirely sure what the error means.  I've checked the Web Proxy tab for the Internal Network on the new server and SSL was not enabled.  I've tried enabling it and specifying the certificate with the subject name of the server, but that
made no difference.  I also tried using the OWA certificate, which of course also failed (no surprise there).  (I don't think the old ISA server has SSL enabled on the Internal Network anyway, but I'll need to confirm this.)
Does anyone have an idea as to how I resolve this?  I'm guessing that maybe I'm missing the meaning of the error and I'm hoping someone else can help with this.  I'm not finding much about this on Web about this error.
Thanks in advance for any help.

Answer 1

I think I may have gotten around the problem. 
On the original ISA server it turned out that SSL was enabled on the Internal Network, so I disabled that, exported the configuration again and imported that to the EMS.  Now when I try to join the TMG to the array, the EMS can communicate with it,
which seems to be further than I got before.  That said, I think it may have been a mistake to import the ISA config a second time because I now get a different error that seems to suggest an old version is detected.  If that's the case,
then I think I can just rebuild the EMS and import the ISA config again, then attempt to join the TMG to the array again.
Both the EMS and the TMG server were at RTM version, so I also got them both up to Service Pack 2.  I don't think that made any difference with the issue, but it's worth mentioning. 
Based on what I did, I do have a question:  If an ISA 2006 config is imported to TMG 2010 EMS, will importing the same config a second time to the same EMS cause problems?  My thinking is that once the config is imported, the imported settings
are upgraded to TMG 2010 and that the second import may break things because of that.  Knowing the answer to that question will tell me whether or not I need to rebuild the EMS.