Firefox seems to be ignoring DNS TTL and DNS resolved cache indefinitely
Hello
Since we started to serve our js and css by CloudFront a few weeks ago, we started to see a problem with Firefox, where these goods would not sometimes be charged.
So far, the only way I could reproduce the problem has been to load our home page in the afternoon, without closing my browser and then refresh the page the next day morning. I know it's pretty extreme, but some customers reported this problem, which means that it happens in both real life scenarios. We have been able to reproduce it on Windows and OSX from our office in New York and Krakow, Poland.
I used Firebug to track down this problem and it seems that Firefox is ignoring the TTL of DNS queries when looking for URLS and caches them almost indefinitely. Due to the constant rotation of the CloudFront servers, after enough time the cached IP address server unresponsive and all applications are abandoned (applications abandoned on the screenshots). That sounds like a plausible explanation? Has anyone have the same problem and has a solution for this?
Screenshot taken: 2013 - 06-13 at 22:29:30 watch the page loaded with success, then one taken on 2013-06-14 at 09:33:30 watch tab firebug "Net" with all requests of the asset given up. Force-refresh the page several times allows, as shown in the screenshot of 09:34:03.
https://S3.amazonaws.com/fpfonts/screen+shot+2013-06-13+at+10.29.30+pm.PNG
https://S3.amazonaws.com/fpfonts/screen+shot+2013-06-13+at+11.31.23+am.PNG
https://S3.amazonaws.com/fpfonts/screen+shot+2013-06-14+at+9.33.30+am.PNG
https://S3.amazonaws.com/fpfonts/screen+shot+2013-06-14+at+9.34.03+am.PNG
The page that we are now it work debugging on is http://preprod.freshpair.com/ (awsforums:awsforums) but I saw this on other sites as well.
Dig the results at a time from the first view of the page:
dig dfndz4rv44deo.cloudfront.net
- <> <> >DiG 9.7.6 - P1 <> <> dfndz4rv44deo.cloudfront.net
- global options: + cmd
- The answer:
- -> > Header < <-opcode: QUERY, status: NOERROR, id: 16168
- flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 0
- QUESTION SECTION:
- SECTION OF THE ANSWER:
dfndz4rv44deo. CloudFront.net. 48 IN a 54.240.162.137
dfndz4rv44deo. CloudFront.net. 48 IN a 54.240.162.56
dfndz4rv44deo. CloudFront.net. 48 IN a 54.240.162.166
dfndz4rv44deo. CloudFront.net. 48 IN a 54.240.162.49
dfndz4rv44deo. CloudFront.net. 48 IN a 54.240.162.116
dfndz4rv44deo. CloudFront.net. 48 IN a 54.240.162.223
dfndz4rv44deo. CloudFront.net. 48 IN a 54.240.162.164
dfndz4rv44deo. CloudFront.net. 48 IN a 54.240.162.245
- Query time: 16 msec
- SERVER: 192.168.0.69 #53 (192.168.0.69)
- WHEN: Thursday, June 13, 22:29:11 2013
- MSG SIZE rcvd: 174
And then the next:
dig dfndz4rv44deo.cloudfront.net
- <> <> >DiG 9.7.6 - P1 <> <> dfndz4rv44deo.cloudfront.net
- global options: + cmd
- The answer:
- -> > Header < <-opcode: QUERY, status: NOERROR, id: 40362
- flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 0
- QUESTION SECTION:
- SECTION OF THE ANSWER:
dfndz4rv44deo. CloudFront.net. 60 IN a 216.137.61.248
dfndz4rv44deo. CloudFront.net. 60 IN a 54.230.94.74
dfndz4rv44deo. CloudFront.net. 60 IN a 54.230.92.193
dfndz4rv44deo. CloudFront.net. 60 IN a 216.137.61.238
dfndz4rv44deo. CloudFront.net. 60 IN a 54.230.95.250
dfndz4rv44deo. CloudFront.net. 60 IN a 216.137.61.145
dfndz4rv44deo. CloudFront.net. 60 IN a 216.137.61.253
dfndz4rv44deo. CloudFront.net. 60 IN a 216.137.61.105
- Query time: 183 msec
- SERVER: 10.94.2.100 #53 (10.94.2.100)
- DATE: Fri Jun 14 09:33:15 2013
- MSG SIZE rcvd: 174
Thank you khozlov!
Tags: Firefox
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