I have upgraded to 2.3.5 and WordPress 3.6.
On the requested steps: the debugger does NOT show on my screen as on http://jetpack.me/2013/06/19/jetpack-2-3/. Therefore I am taking a different path.
I discovered that other people have used the "Core Control" plugin to help debug Jetpack. I installed that plugin. I turned on logging. What follows is the log from the request (I obsursed the secret keys):
URL
https://jetpack.wordpress.com/jetpack.register/1/
Method
POST
Result
error
Error Details
http_request_failed Operation timed out after 15008 milliseconds with 0 bytes received
Time Taken
15.188367843628 seconds
HTTP Args
timeout (integer) 15
redirection (integer) 5
httpversion (string) 1.0
user-agent (string) WordPress/3.6; http://marktab.net/datamining
reject_unsafe_urls (boolean) false
blocking (boolean) true
headers Array
(
[Accept] => application/json
)
cookies Array
(
)
compress (boolean) false
decompress (boolean) true
sslverify (boolean) true
stream (boolean) false
filename NULL
limit_response_size NULL
HTTP POST body
Array
(
[siteurl] => http://marktab.net/datamining
[home] => http://marktab.net/datamining
[gmt_offset] => -4
[timezone_string] => America/New_York
[site_name] => MarkTab Data Mining
[secret_1] => XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
[secret_2] => XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
[site_lang] => en_US
[timeout] => 15
[stats_id] => 11790574
)
HTTP Transports
WP_HTTP_curl
Request Time
2013-08-16 23:44:21 --400