Google Cloud xDrip - NightscoutUploader fail (SSL Handshake Exception)

[mr-mjb]

Hi there,
I've deployed Nightscout in Google Cloud using the xdrip+ teams excellent installer but after 24 hours of stable performance this morning when my daughter (who's phone is running xdrip+) went to school her readings stopped reporting into Nightscout, although Dexcom Share which xdrip+ is also uploading into was fine. It conincided with her moving onto 4G coverage as she left the house but this may be coincidental.
Then it started working again by itself around 2pm without any intervention.
The nightscout site was up and when she got home I've checked the xdrip logs which is showing some SSLHandshake Exception as shown in the screen capture below:

I logged into the google cloud instance and checked the nginx and letsencrypt logs in /var/log/ and nothing is standing out as an issue.

Any thoughts?

It may be fine now but really strange it fixed itself without understanding why....

[Navid200]

Can you check on the following page?

Settings −> Cloud Upload −> Nightscout Sync

Is "Use mobile data" enabled on that page?

[mr-mjb]

Yes it’s enabled

[Navid200]

What happened around 2? Is that when your daughter left school?

[mr-mjb]

Does the freeDNS script have a log? I’m wondering if the Google cloud instance IP changed and there was a DNS cache somewhere

[mr-mjb]

Its not a DNS issue, i checked the DNS history and the IP had not changed...

Same has happened this morning which is strange. I should have tested moving the phone onto 4G last night to replicate it.
I installed tcpdump and took a pcap from the the google cloud server and seems seems there is communication from her phone and the server but the phone is sending a TCP RST so somethings not right at the lower level. Seems its just looping around SYN -> SYN,ACK -> ACK and then finally RST,ACK.

I rebooted the server and issue is still there.

[tzachi-dar]

Your case is very weird, but someone else has complained that there is a problem with freedns.
You might want to try and move to another dns provider in order to see if the problem still exists.
See my comment on #2441 (reply in thread) on how to do it.

[mr-mjb]

Thanks and I agree it’s very weird!!
I’ll do some more tracing when she’s home and I have the phone tonight.
I agree moving to another DNS might solve the issue

[mr-mjb]

I believe the problems solved….
It seems the domain privatedns.org is black listed by my mobile network as and adult website and the subscription for my daughters phone had an adult content bar applied.
I removed the adult bar and now it seems it’s working fine 🤞(this is fine for me as my daughter doesn’t use the phone as she’s only 5 but may not be appropriate for others).

Why it worked yesterday after when she was still at school I have no idea.

So it seems there are no issues with xdrip+ working with the Google Cloud installation but others should be cautious that these dynastic DNS domains might be black listed as adult content sites by mobile operators.

Thanks for the support as always!