Hello, When I use an ssh client built from the openssh.org OpenSSH_5.1p1 sources on Mac OS 10.5.5 (Darwin Kernel Version 9.5.0: Wed Sep 3 11:29:43 PDT 2008; root:xnu-1228.7.58~1/RELEASE_I386 i386), I get the following error when trying to launch an xterm in a remote ssh session: debug1: client_input_channel_open: ctype x11 rchan 3 win 2097152 max 16384 debug1: client_request_x11: request from 127.0.0.1 54813 /tmp/launch-LP0nSk/: unknown host. (nodename nor servname provided, or not known) debug1: failure x11 X connection to localhost:14.0 broken (explicit kill or server shutdown). When I use the ssh client provided by Mac OS (also OpenSSH_5.1p1), it works: debug1: client_input_channel_open: ctype x11 rchan 3 win 2097152 max 16384 debug1: client_request_x11: request from 127.0.0.1 53387 debug2: fd 7 setting O_NONBLOCK debug3: fd 7 is O_NONBLOCK debug1: channel 1: new [x11] debug1: confirm x11 I think this is a new problem that appeared when I updated to Mac OS 10.5.5 from 10.5.4. Has anyone else seen this problem? Is there a workaround? I'd be happy to provide more details on request. Thanks, Jim