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https://support.symantec.com/us/en/article.TECH240940.html
When accessing a Websocket supported webpage through CacheFlow it will fail to load. This happens because the CacheFlow will strip the "Connection: Upgrade" header and the "Upgrade: Websocket" header when sending the request upstream.
https://support.symantec.com/us/en/article.TECH247199.html
Websocket protocol not sent to ICAP for scanning from Symantec ProxySG ex: web.whatsapp.com
https://origin-symwisedownload.symantec.com/resources/webguides/proxysg/security_first_steps/Content/PDFs/Control_Streaming_Solution.pdf
ControllingStreamingMedia n Flashmedia(RTMP)usesport1935. n RealTimeStreamingProtocol(RTSP)usesport554. n MicrosoftMediaServer(MMS)usesport1755 ...
https://stackoverflow.com/questions/9612690/websockets-and-a-proxy
It turns out that the proxy we are using BlueCoat doesn't support WebSockets for the good old reason of "security" or the such. Even when going to my local address and the proxy gets in the way and prevents the use of sockets. Obviously if I bypass local addresses this will work except on (Automatically Detect)
https://kc.mcafee.com/corporate/index?page=content&id=KB84052&actp=null&showDraft=false&locale=en_US&viewlocale=en_US
Sep 20, 2019 · McAfee Web Gateway (MWG) used as proxy where client or web server wants to initiate or establish WebSocket connection.. With an explicit proxy, a client WebSocket request on port 80 contains an Upgrade: websocket header. MWG allows the establishment of a tunnel so communication between the client, MWG, and the webserver is established. To import the rule set: Log on to MWG.
https://docs.microsoft.com/en-us/azure/application-gateway/application-gateway-websocket
The following is a snippet of an httpListeners element from a sample template file. You would need both HTTP and HTTPS listeners to support WebSocket and secure WebSocket traffic. Similarly you can use the portal or Azure PowerShell to create an application gateway with listeners on port 80/443 to support WebSocket traffic.
https://serverfault.com/questions/693375/bluecoat-proxy-times-out-on-certain-https-sites
Again, this is very crazy. This seems to happen because of an odd interaction between Bluecoat's OS and (outdated) F5's used at the other end. More specifically, Bluecoat's TCP silly window syndrom (SWS) avoidance algorithm seems to trigger this:
https://bugzilla.mozilla.org/show_bug.cgi?id=766817
BTW, I'm not sure exactly why Bluecoat says it doesn't > support websockets, the websocket echo demo works (I tried both SSL and > non-SSL to be sure). It probably says that because it doesn't support them transparently, but when configured to allow an explicit tunnel through the proxy it …
https://arno0x0x.wordpress.com/2017/11/10/using-websockets-and-ie-edge-for-c2-communications/
Glad to introduce WSC2, C2 over WebSocket. But first, a bit of context... In the wake of my latest researches around various covert channels for C2 communications and/or payload delivery (DBC2, DNSDelivery, WebDavC2, WebDavDelivery) I decided to have a look at something I've always left on the side until now: WebSockets. The idea first came…
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