# Is the citation helper broken?

For the last several days I've had no luck using the citation helper. Whenever I attempt to search for anything, although a search seems to be ongoing even letting it sit for minutes doesn't produce any results.

(The dots below the search string cycle as though searching. Screenshot courtesy of Martin Sleziak; thanks.)

I inquired if anyone else was having difficulty in the MathOverflow chat room, and so far 100% of the respondents have reported a similar issue. (Granted, so far there has only been one response.)

• According the the Chrome console, I get the following errors, Failed to load resource: net::ERR_INSECURE_RESPONSE and GET https://ec2.mathoverflow.org/cite?q=&_=########### net::ERR_INSECURE_RESPONSE.
• According to the Microsoft Edge console I'm getting the error SCRIPT7002: XMLHttpRequest: Network Error 0x800c0019, Security certificate required to access this resource is invalid.

This seems to be a security certificate issue.

• The certificate is expired since february 20. Which shouldn't happen in this case as it's from Let's Encrypt, which is meant to be set up with an automated way of certificate renewal. This automation seems to be broken for some reason.
– user35354
Mar 2, 2017 at 18:30
• And we finished the zbMath helper a while ago anyway.
– Asaf Karagila Mod
Mar 2, 2017 at 20:04
• Sorry --- I'll fix the certificate automation later today. Not sure what happened. I'll also contact Stack Exchange again about plugging in the new zbMath backend... Mar 2, 2017 at 22:20
• @Scott: Any news on the former task? It seems that the citation helper still fails to fetch results.
– Asaf Karagila Mod
Mar 5, 2017 at 18:30
• Let's Encrypt seems to have become broken on Amazon Linux, which is where we run the citation backend. I'm stuck for now, and am about to start escalating moving to our zbMath backend. Mar 5, 2017 at 22:23
• We've finally switched over to the zbMath backend, so this issue is now irrelevant. Mar 13, 2017 at 20:58