http works, but https does not

I have a IIS website running behind a hardware based NLB - I have configured the website with SSL binding. However, the https URL (https://url1.contoso.com) does not work. Here is a list of diagnostic info that I gathered:

I can successfully browse non-SSL version of the website: http://url1.contoso.com

Here is the "Site Binding":
Type   Host Name             Port   IP Address        Binding
http    url1.contoso.com    80     123.45.678.90
https                                  443   123.45.678.90

Certificate has the following "Subject Alternative Name":
DNS Name=server1.contoso.com
DNS Name=url1.contoso.com
DNS Name=url2.contoso.com

(Note that ur2.contoso.com is another web application running on a different IP address on the same server.)

Firewall is turned off.

C:\Windows\system32>netstat -aon | find ":443 "
TCP    0:0:0:0:443    0:0:0:0:0    LISTENING    4
TCP    [::]:443           [::]:0          LISTENING    4

I used netmon to capture the traffic and noticed I only see the client sending SSL request, but the server is not responding to the SSL conenction request:

Process Name    Source                 Destination       Protocol Name     Description
                           567.89.123.456    123.45.678.90    SSL                       SSL:SSLv2RecordLayer, ClientHello (0x01)
                           567.89.123.456    123.45.678.90    SSL                       SSL:SSLv2RecordLayer, ClientHello (0x01)
                           567.89.123.456    123.45.678.90    SSL                       SSL:SSLv2RecordLayer, ClientHello (0x01)
                           567.89.123.456    123.45.678.90    SSL                       SSL:SSLv2RecordLayer, ClientHello (0x01)
                           567.89.123.456    123.45.678.90    SSL                       SSL:SSLv2RecordLayer, ClientHello (0x01)

However, I have ANOTHER server running the exact same web applications and for that https is working fine. On that server I captured the following traffics when the website was browsed athttps://url2.contoso.com:
 
Process Name    Source                 Destination       Protocol Name     Description
                            567.89.123.456    123.45.678.91    SSL                       SSL:SSLv2RecordLayer, ClientHello (0x01)
                           123.45.678.91      567.89.123.456  SSL                       SSL:SSLv3 Rec Layer-1 HandShake: Server Hello. Certificate.

I also compared the 2 servers - they look exactly the same. Any insight on what's going on and what to try next. Btw, I am running Windows Server 2008 R2.

Any help would be highly appreciated!

Thanks,
John