+ Post New Thread
Results 1 to 10 of 10
Internet Related/Filtering/Firewall Thread, Issues accessing Prezi in Technical; Had a helpdesk logged by a teacher, saying she is unable to access prezi.com. On request for further information, I ...
  1. #1
    Hawkeyez's Avatar
    Join Date
    Jul 2005
    Posts
    272
    Thank Post
    7
    Thanked 23 Times in 20 Posts
    Rep Power
    25

    Issues accessing Prezi

    Had a helpdesk logged by a teacher, saying she is unable to access prezi.com. On request for further information, I was told, she could get to the site, login fine, but was unable to create/edit presentations. An error stating;

    There was a problem loading your prezi.

    Please check your internet connection or firewall, and allow traffic to prezi.com. Also, please make sure you have the latest version of Flash.


    After checking flash versions etc, and testing on other machines, I determined, that either going via RM Smartcache, or direct to of LEA Proxy, had the same result.

    Next step was to look at our ISA box. After running a monitor on my attempts to access the site, I got the following


    Failed Connection Attempt CLW-SR-ISA 15/06/2012 10:35:56
    Log type: Web Proxy (Forward)
    Status: 995 The I/O operation has been aborted because of either a thread exit or an application request.
    Rule: SysAdmin PC External Access
    Source: Internal (192.168.2.68)
    Destination: External (46.18.180.65:80)
    Request: log.prezi.com:443
    Filter information: Req ID: 0fd5205e; Compression: client=No, server=No, compress rate=0% decompress rate=0%
    Protocol: SSL-tunnel
    User: anonymous
    Additional information
    Client agent: Mozilla/5.0 (Windows NT 5.1; rv:12.0) Gecko/20100101 Firefox/12.0
    Object source: Upstream (Object was returned from an upstream proxy cache.)
    Cache info: 0x0
    Processing time: 0 ms
    MIME type:

    Anyone had this before? or know what I could do to resolve?

  2. #2

    Join Date
    May 2011
    Location
    Jus North of London, close but not too close
    Posts
    781
    Thank Post
    175
    Thanked 58 Times in 56 Posts
    Rep Power
    35
    Just noticed in your post:

    Destination: External (46.18.180.65:80)
    Request: log.prezi.com:443

    Have you identified the 46.18.180.65 ip address? I don't need to know what it is but could it be your upstream proxy blocking as the destination is port 80 (http)and the site is requesting a 443 (https)

    To me it looks like the upstream proxy is blocking the 443 request.

    Have a word with the LEA providing the proxy I guess would be an idea.

  3. #3
    Hawkeyez's Avatar
    Join Date
    Jul 2005
    Posts
    272
    Thank Post
    7
    Thanked 23 Times in 20 Posts
    Rep Power
    25
    Our Macs using Smoothwall, that bypass our ISA is fine, just any traffic going though the ISA box is having issues.

    46.18.180.65 is the IP of the LEA's proxy.

  4. #4
    36Degrees's Avatar
    Join Date
    Jan 2010
    Location
    Nottingham
    Posts
    1,060
    Thank Post
    165
    Thanked 153 Times in 124 Posts
    Rep Power
    52
    Did you get an answer to this? We are having the same issue and although I will contact the LEA any additional information would be gratefully received.

  5. #5

    glennda's Avatar
    Join Date
    Jun 2009
    Location
    Sussex
    Posts
    7,810
    Thank Post
    272
    Thanked 1,135 Times in 1,031 Posts
    Rep Power
    349
    You will find that Prezi launches Java script from one of google's servers. that is the cause of the issue with the page not being loaded as this tends to be blocked.

  6. Thanks to glennda from:

    36Degrees (10th July 2012)

  7. #6
    36Degrees's Avatar
    Join Date
    Jan 2010
    Location
    Nottingham
    Posts
    1,060
    Thank Post
    165
    Thanked 153 Times in 124 Posts
    Rep Power
    52
    That confuses me even more as we have supposedly had the LEA's firewall rules amended to allow access to all google servers, due to issues we had with Google Docs! I don't suppose you know which Google server?

  8. #7

    glennda's Avatar
    Join Date
    Jun 2009
    Location
    Sussex
    Posts
    7,810
    Thank Post
    272
    Thanked 1,135 Times in 1,031 Posts
    Rep Power
    349
    I have a feeling it something like code.google or similar - if you open up the page and view the source you can see the Js its trying to pull i think.

  9. 2 Thanks to glennda:

    36Degrees (10th July 2012)

  10. #8
    Hawkeyez's Avatar
    Join Date
    Jul 2005
    Posts
    272
    Thank Post
    7
    Thanked 23 Times in 20 Posts
    Rep Power
    25
    Still the same here, added all sorts of different domains to the allow lists on the filtering (as below), and still get the same issue.

    Domains..

    .prezi.com

    .prezi.com:443

    .cloudfront.net

    .cloudfront.net:443

    s3.amazonaws.com

  11. #9

    glennda's Avatar
    Join Date
    Jun 2009
    Location
    Sussex
    Posts
    7,810
    Thank Post
    272
    Thanked 1,135 Times in 1,031 Posts
    Rep Power
    349
    If you load the page and then view the source you should be able to see the pages its loading. Or try firebug.

    It used to load the JS files from google which is most likely blocked.

  12. #10
    Duke5A's Avatar
    Join Date
    Jul 2010
    Posts
    806
    Thank Post
    83
    Thanked 132 Times in 115 Posts
    Blog Entries
    8
    Rep Power
    32
    Inspect your proxy logs for all outgoing connections from a client with Prezi loaded in the browser the moment the page refreshes. I've had sites pull content from servers by using an IP address instead of a domain name and our upstream proxy is setup to block browsing by IP. Placing that single IP on a white list usually fixes that.

    Another issue I've seen is pretty much the same scenario, but the IP address keeps changing as the external content was hosted on a cloud service.

    I hope this helps...

SHARE:
+ Post New Thread

Similar Threads

  1. Blackberry Outlook web access snyc issues
    By flyinghaggis in forum Hardware
    Replies: 13
    Last Post: 17th March 2009, 05:18 PM
  2. Ranger issue?! BBC site closes down whenever it is accessed
    By IT_Man_Dan in forum Network and Classroom Management
    Replies: 12
    Last Post: 1st February 2009, 05:53 PM
  3. Licensing issues associated with student remote access to terminal servers
    By meastaugh1 in forum Thin Client and Virtual Machines
    Replies: 2
    Last Post: 24th October 2008, 11:56 AM
  4. [MS Office - 2003] MS ACCESS 2003 and NO PRINTER ISSUE
    By ajap99 in forum Office Software
    Replies: 2
    Last Post: 2nd April 2008, 06:13 PM
  5. Outlook Web Access issue
    By JAW$ in forum Windows
    Replies: 2
    Last Post: 19th March 2008, 02:32 PM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •