Please note that, per my message last night, this is also happening (my TA claims he saw the *identical* text: multiple red lines, etc.) on macOS 11. So it's not just for Windows any more.
On Thu, Sep 10, 2020 at 9:20 AM George Neuner <gneun...@comcast.net> wrote: > > On 9/10/2020 7:37 AM, Hendrik Boom wrote: > > On Thu, Sep 10, 2020 at 12:49:25AM -0400, George Neuner wrote: > > > > > > I don't know if DrRacket even sends a "user agent" string. > > > > If DrRacket can send a user agent string, so can malware. > > > > So it's not really reliable to filter on the user agent string. > > > > -- hendrik > > Of course ... any HTTP request can forge a user agent string: most > browsers allow you to change it, and so do some HTTP aware > applications. E.g., there is a plugin for Firefox that changes it on > the fly based on the URL - use cases involve things like Google image > search behaving differently for Chrome vs non-Chrome users, and > Microsoft sites behaving differently for non-Windows users. > > My point is that there may be something unseen - probably a firewall - > blocking the DrRacket request but not blocking requests from the known > browser. If it isn't some software installed on the machine itself, it > likely is an IT appliance guarding the whole network. Firewall > appliances are NAT routers: they can look inside even encrypted > connections to examine protocols being used and the raw data passing > through. > > Based on the error from Shriram's message, it looks like DrRacket is > successfully calling out but doesn't like/understand the response ... > which would tend to eliminate Windows built-in firewall as a suspect [it > doesn't do protocol inspection]. It still could be other AV/firewall > software on the machine, or something upstream in the network that his > student is unaware of. > > YMMV, > George > > -- > You received this message because you are subscribed to a topic in the > Google Groups "Racket Users" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/racket-users/7rMAEma8Xkg/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > racket-users+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/racket-users/8a1628af-b647-5272-1c9a-da347b604091%40comcast.net > . > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CAJUf2yQcbB98opH%3D%2BYs0R6XTFAY14hphTnQejnvPRf%3D03o12qQ%40mail.gmail.com.
