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Then I would worry that your local X11 server doesn't support glut. 3d graphics is an additional layer to the protocol and not every server supports it, since the performance over the network is quite poor in the best of circumstances. Dale Tronrud On 7/1/2015 4:05 PM, Chen Zhao wrote: > Thank you Dale, but when I added " localhost:10.0" to X display > location, the problem still exist, just without the phrase > "localhost:10.0" in the warning. My X11 forwarding is enabled all > the time and all other GUIs work just fine. > > And thank you for your clarification on the concept of server and > client "in the X11 word". It makes a lot of sense and I just didn't > give it a second thought! > > Best, Chen > > On Wed, Jul 1, 2015 at 6:47 PM, Dale Tronrud > <[log in to unmask] <mailto:[log in to unmask]>> wrote: > > > Both the ssh client and server must be set up with "X11Forwarding > yes". The message sounds like your local computer is not set up > to accept X11 tunneling. (By the way, in the X11 world the remote > system is the "client" and your local system the "server".) > > Dale Tronrud > > On 7/1/2015 3:40 PM, Chen Zhao wrote: >> Hi all, > >> Sorry to bother you, but I am trying to fix a long-standing >> problem that I cannot run Coot and Pymol through Xming/PUTTY by >> SSH connection on a windows client. The error messages are >> pretty similar for both: Coot: PuTTY X11 proxy: unable to connect >> to forwarded X server: Network error: Connection refused >> (coot-real:23113): Gtk-WARNING **: cannot open display: >> localhost:10.0 Pymol: PuTTY X11 proxy: unable to connect to >> forwarded X server: Network error: Connection refused freeglut >> (pymol): failed to open display 'localhost:10.0' > >> Does anybody have some ideas? > >> Thank you so much, Chen > >