multiple IP addresses for api.fitbit.com, and one does not work

[John-S]

Sometimes api.fitbit.com resolves to 104.16.66.50 and sometimes it resolves to 104.16.65.50.  Attempts to connect to 104.16.65.50 on port 443 have been timing out since yesterday afternoon, only from one of my hosts.

nslookup returns the following.

$ nslookup api.fitbit.com
Non-authoritative answer:
api.fitbit.com canonical name = api.fitbit.com.cdn.cloudflare.net.
Name: api.fitbit.com.cdn.cloudflare.net
Address: 104.16.66.50
Name: api.fitbit.com.cdn.cloudflare.net
Address: 104.16.65.50

This always works, when api.fitbit.com resolves to .66

$ telnet api.fitbit.com 443

Trying 104.16.66.50...

Connected to api.fitbit.com.

Escape character is '^]'.

This never works, when api.fitbit.com resolves to .65

$ telnet api.fitbit.com 443

Trying 104.16.65.50...

I temporarily added the line below to my hosts file, but I'm hoping there's a better suggestion.

104.16.66.50 api.fitbit.com

[JeremiahFitbit]

@John-S: Are you still experiencing this problem? I'm able to connect to 104.16.65.50 from three different ISPs.

[John-S]

Yes, still experiencing the problem.

$ date
Fri Dec 4 12:29:08 CST 2015

worked

$ telnet 104.16.65.50 443
Trying 104.16.65.50...
Connected to 104.16.65.50.
Escape character is '^]'.

5 seconds later, did not work

$ telnet 104.16.65.50 443
Trying 104.16.65.50...

5 seconds later, still not working

$ telnet 104.16.65.50 443
Trying 104.16.65.50...

1 minute later, works again

$ telnet 104.16.65.50 443
Trying 104.16.65.50...
Connected to 104.16.65.50.

a few seconds later, timeouts again.

Can you confirm a firewall or IDS is not blocking traffic?  I emailed you earlier today with my source IP address, application names, and client IDs.

Edit: removed email address

[goodes]

I seeing the same thing. After tracing the requests, it appears the cloudfare is putting up a capatcha screen (i.e. go to https://client.fitbit.com/tracker/client/message in your browser) - even if you set pass the capatcha and it sets the cookie in the browser, the app or my phone on wifi will continue to fail as cloudflare is blocking the connection.

[JeremiahFitbit]

@goodes: If you're making a high volume of requests, CloudFlare may do this. Contact us privately and we can look into it.