Teamviewr added to one of the blocked categories, not sure why.

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    rotblitz

    It can happen at any time that domains are being approved for additional categories.  The "why" is that the domain tagging system is very dynamic and may have received enough votes to get a domain approved for a category.
    https://domain.opendns.com/teamviewer.com

    "I get a message from teamviewer saying there was an "unkown reason" why it couldn't connect."

    Weird, this really does not look like something by OpenDNS.  It is not an OpenDNS block page, but apparently a browser generated message.  Especially, DNS is not about connections, but about name resolutions.

    Also, Teamviewer use dozens of domains and subdomains, and it could be that some are being blocked by your dashboard settings.  See here the domains being used only at their main web page:
    https://www.webpagetest.org/result/171106_SS_020f2b850c1dd8345e8d19ea63311fe4/1/domains/

    And now compare this list with https://dashboard.opendns.com/stats/all/blockeddomains to possibly find some of their domains as being blocked by your settings.

    Further, Teamviewer tend to use CNAMEs where also CNAME resolution could be impacted by your settings:

    nslookup www.teamviewer.com.
    Server:  local
    Address:  10.165.161.13

    Non-authoritative answer:
    Name:    tvcomofflive.eastus.cloudapp.azure.com
    Address:  40.117.35.172
    Aliases:  www.teamviewer.com
              teamviewer-com.trafficmanager.net

    The complete plain text outputs of the following diagnostic commands may reveal more facts, in case this is a DNS problem.

    nslookup -type=txt debug.opendns.com.
    nslookup www.teamviewer.com.
    nslookup tv-static.net.
    nslookup teamviewer-com.trafficmanager.net.
    nslookup azure.com.

    "I started capturing my traffic"

    Yes, this is a good approach in case this issue is not DNS related.

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