Azure CDN Slow Response time RRS feed

  • Question

  • We are having weird issue:

    While accessing CDN (tied to blob images) we get this occasional slowness in images loading between 8:00AM to 9:00AM EST. Also we have SiteGuardian tool setup to monitor our page which has CDN Images which reports slowness in getting images.

    Sometimes we get slow response:

    URL https://xxxxx.vo.msecnd.net/xxxxxx/629120870.jpg
    Content-Type application/octet-stream
    Element Type image
    Resolve host time 1.032823 seconds
    Request connect time 0.012877 seconds
    Request transmit time 25.593073 seconds
    Response server time 0.337203 seconds
    Response receive time 0.002101 seconds
    Total time 26.98s
    Response 200 - OK
    Size 23 K

    When things are fine we get a quick response:

    URL https://xxxxx.vo.msecnd.net/xxxxxx/629120870.jpg
    Content-Type application/octet-stream
    Element Type image
    Resolve host time 0.012714 seconds
    Request connect time 0.035204 seconds
    Request transmit time 0.294088 seconds
    Response server time 0.254342 seconds
    Response receive time 0.006517 seconds
    Total time 603ms
    Response 200 - OK
    Size 23 K

    And sometime it just times out.

    What is the best way to trouble shoot such scenario? Is there any logging available if a request fails or if there is slowness in response time? Also, anyway to find out which CDN nodes things are cached at etc?

    Thanks in advance.

    Tuesday, March 4, 2014 9:12 PM

All replies

  • Hi,

    I suggest you use fiddler to check the URL https://xxxxx.vo.msecnd.net/xxxxxx/629120870.jpg , hope this tool can trouble shoot this scenario, hope this helps.

    Best Regards

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    Wednesday, March 5, 2014 9:36 AM
  • Hi - Our issue is not yet resolved.

    We have CDN connected to Azure Blob Storage Account. We let CDN Heuristics control the caching as our images (blobs) do not have any cache control policy set at this time.

    We enabled log and we are seeing such entries, one is below:

    1.0;2014-03-07T14:35:43.8958635Z;GetBlob;AnonymousClientOtherError;304;4;4;anonymous;;containername;blob;"http://XXXX.blob.core.windows.net/image1087175937.jpg";"/containername/image1087175937.jpg";abcc2dd9-cf8d-42c5-9e54-7dd9d96a3177;0;;2009-09-19;696;0;116;0;0;;;;;"If-None-Match=Tuesday, 04-Mar-14 00:22:58 GMT";"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; BRI/2; EIE10;ENUSWOL)";"REFERRER URL";

    Are such entries getting logged because of CDN or why do we get these?  The IP address is a Microsoft IP.

    Based on documentation it seems:


    Indicates that the anonymous requests failed precondition checks (like If- Modified etc.) for GET requests.

    Examples: Conditional GET requests that fail the check.

    Thanks in advance.

    Monday, March 10, 2014 7:04 PM