Hello, Mr. Tanner. Cygwin/X uses the X11 server for all GUI displays. X11 is a network-aware display server and uses network connections for all communication between the display/input devices and the client applications. This is what allows a GUI program running on one PC to take all of its input from and display all of its output to another PC.
It's no different when both the GUI and programs are running on the same PC. X11 just opens a network connection to itself using the loopback interface (lo on most systems), and that's what ZA and other Windows firewall programs trip on. Basically, everything X11-related should be allowed not only to connect to 127.0.0.1 without restrictions, they should also be allowed to act as servers listening on 127.0.0.1. Without that, Cygwin/X will be degraded at best, and unable to work at all at worst. -ArielMT On Tue, 27 Sep 2005 06:30:30 +0100 Herbert Eppel wrote: > On 27.09.2005 06:18 UK Time, Jack Tanner wrote: > > Herbert Eppel wrote: > > > >> No doubt this is a very basic question, and I'm not sure whether it > >is > really a question for this group or whether I should direct it > >to the > authors and/or user group of the ESP-r software, but I > >wonder whether > someone could shed some light on why Cygwin/X (or > >perhaps it is just > the individual components of the ESP-r software > >I am running?) > triggers ZoneAlarm access permission alerts and > >generates constant > internet traffic (or perhaps only 'trusted > >zone' traffic?) as > indicated by ZoneAlarm? > > > > > > Chances are that you're seeing Cygwin/X connect to itself via TCP. > > This is normal. > > Hi Jack, > > thanks for your reply. I don't really understand why Cygwin/X needs to > > connect to itself, but it seems a likely explanation for the traffic I > > am seeing. > > > > > Furthermore, Zone Alarm is a source of problems for many Cygwin/X > > users. The two are known to conflict. See > > http://x.cygwin.com/docs/faq/cygwin-x-faq.html. > > I don't actually have a problem with ZoneAlarm, I was just curious > about why the various components of the ESP-r software I am using > (and indeed some external ones that came bundled with that software, > for example xv.exe) triggered a one-off ZoneAlarm access permission > alert when they were launched for the first time (they are now listed > in ZoneAlarm's list of programs). Can you offer further enlightenment > here, or would the ESP-r user list a more appropriate forum for this > question? > > Thank you. > > Herbert Eppel > -- > www.HETranslation.co.uk > > > > -- > Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple > Problem reports: http://cygwin.com/problems.html > Documentation: http://x.cygwin.com/docs/ > FAQ: http://x.cygwin.com/docs/faq/ > > -- "The most humbling achievement of the past millennium, I believe, is the evolution of the simplest form of communication: the written letter. >From courier to post to telegram to fax to email, each advancement has made the awesome power of writing more accessible than ever before." -Ariel Millennium Thornton, Spokesman and Mascot, Thornton 2 Productions -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://x.cygwin.com/docs/ FAQ: http://x.cygwin.com/docs/faq/
