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Categorization sometime fails -> long loading time of website

Jas Man

Hi,

I've activated the web filtering in transparent mode on my UTM (now 9.352-6) a half year ago. Since then I realized that different websites take a long time to load sometimes. In this case the webbrowser shows "Waiting for answer...." and a white page. After 5-8 seconds the website comes up.


Today I did some research to find the cause of this problem.


It seems that the web proxy can't categorize single objects like scripts or pictures correctly during loading sometimes. The rest of the site is categorized normaly. When this happens, the single object is categorized as "Uncategorized" and the categorisation takes a long time. Here is an example from today of an picture of a website, which is mostly categorized correctly as "Forum/Bulletin Board", and sometimes as "Uncategorized":

Categorie "Forum/Bulletin Boards" - Normal loading
2016:01:15-12:53:34 jasnet httpproxy[5217]: id="0001" severity="info" sys="SecureWeb" sub="http" name="http access" action="pass" method="GET" srcip="192.168.10.10" dstip="144.76.168.179" user="" ad_domain="" statuscode="200" cached="0" profile="REF_HttProContaLanNetwo2 (PC)" filteraction="REF_HttCffPc (PC)" size="562" request="0xab1f000" url="www.mazda-forum.info/.../sticky.gif" referer="" error="" authtime="0" dnstime="1" cattime="33652" avscantime="2683" fullreqtime="63720" device="0" auth="0" ua="Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0" exceptions="" category="159" reputation="unverified" categoryname="Forum/Bulletin Boards" content-type="image/gif"


Categorie "Uncategorized" - Slow loading
2016:01:15-12:22:47 jasnet httpproxy[5217]: id="0001" severity="info" sys="SecureWeb" sub="http" name="http access" action="pass" method="GET" srcip="192.168.10.10" dstip="144.76.168.179" user="" ad_domain="" statuscode="200" cached="0" profile="REF_HttProContaLanNetwo2 (PC)" filteraction="REF_HttCffPc (PC)" size="562" request="0xa772000" url="www.mazda-forum.info/.../sticky.gif" referer="" error="" authtime="0" dnstime="1" cattime="6003436" avscantime="2422" fullreqtime="6028436" device="0" auth="0" ua="Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0" exceptions="" category="9998" reputation="unverified" categoryname="Uncategorized" content-type="image/gif"

As a test I added the domain mazda-forum.info to the allowed websites of the web filtering policy, but same problem here:

Allowed website - Slow loading
2016:01:15-12:44:12 jasnet httpproxy[5217]: id="0001" severity="info" sys="SecureWeb" sub="http" name="http access" action="pass" method="GET" srcip="192.168.10.10" dstip="144.76.168.179" user="" ad_domain="" statuscode="200" cached="0" profile="REF_HttProContaLanNetwo2 (PC)" filteraction="REF_HttCffPc (PC)" size="562" request="0xe0c3a000" url="www.mazda-forum.info/.../sticky.gif" referer="" error="" authtime="0" dnstime="0" cattime="6003680" avscantime="2431" fullreqtime="6028730" device="0" auth="0" ua="Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0" exceptions="" content-type="image/gif"

Any idea?

Thank you

Jas



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  • 0 in reply to BAlfson
    But for me it is perceptible. As you can see above, the same object (www.mazda-forum.info/.../sticky.gif) is sometimes categorized as "Forum/Bulletin Boards", and sometimes as "Uncategorized". And if this happen, it took about 5 seconds until the site starts to load.

    Does the categorisation evaluate the complete domain (e.g. mazda-forum.info), and all objects of the domain are categorized into the same category via the local cache? Or is every single object of the domain/site seperatly categorized via a cloud request, and only if the same object is reloaded the local cache is use? Can I see in the logs if the cloud or local cache was used?

    For me it looks like the categorisation of the domain respectively the first object of the site runs into a timeout, therefore it is identified as "Uncategorized". Then the second object gets categorized without any timeout, and the rest is categorized via the local cache.
  • 0 in reply to Jas Man

    The "Uncategorized" item occurred with SXL, not CFFS which was the subject of my prior post.

    To get specifics on how links are categorized, go to TrustedSource where you can experiment with simple FQDNs and with complete URLs.

    You apparently have an access to the SXL servers that isn't as fast as your access to the CFFS servers.  You can see what the categorization time is in the logs, so that should tell you if SXL used cache or a new lookup.

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
  • 0 in reply to BAlfson
    Again thank you, Bob.

    But I still don't understand why the same object is categorized sometimes correctly and sometimes as unknown category with SXL. Maybe it's a understanding-problem of me regarding the language. So sorry if I ask the same question again and again.

    The site TrustedSources categorized the site correctly, but it takes about 7-9 seconds. I don't know it is normal or if this long time is also the problem which I have with the UTM.

    So in my opinion it's a timeout problem.
    Here how I understand the workflow:

    1. User types in a URL to his browser and press enter.

    2. UTM receives the request and tries to find the domain of the URL in his local SXL cache.

    3. If not found, UTM sends a request for the domain to the SXL cloud server.

    4. As long as the UTM has no answer from the SXL cloud server, the website will not loaded. User see "Wait for answer..." or something else in his browser.

    5. UTM receives answer from SXL cloud server.

    6. Website starts to load and from this point, the UTM can use the local cache to categorize the rest of the requestet website.

    7. When step 4 takes to much time, the request is aborted and the categorie will be set to "Uncategorized".

    8. If the SXL request was aborted, the next request for the same domain will be not loaded from the cache (because there is no entry for it), rather it will be send again to the SXL cloud server, and the workflow begins again from step 4.

    If my understanding is correct, the cause must be one of the followings:

    - Slow or problems with the connection to the SXL cloud server (mentioned by Bob)
    - Problems with my Internet connection (DNS, packet lost or something like this)
    - generally problem of UTM (but than there must be more users with this behaviour)
  • 0 in reply to Jas Man
    I think SXL works like that in genereal.

    "But I still don't understand why the same object is categorized sometimes correctly and sometimes as unknown category with SXL" - No change in the underlying database, just a timeout using the SXL method.

    This has been this issue with SXL in the past. It seems to affect installations that have slower or unreliable access. CFFS apparently doesn't have this issue, Both work fine for all of my US clients.

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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