From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; de-AT; rv:1.4.3) Gecko/20040924 Description of problem: X11 forwarding was always default in /etc/ssh/ssh_config. Since openssh 3.8 there are some new parameters for X11 forwarding needed. Typical problem: 1. Error: Can't open display: -> resolution in /etc/ssh/ssh_config Host * ForwardX11 yes 2. connect to RHEL3 or other UNIX X Error of failed request: BadDrawable (invalid Pixmap or Window parameter) Major opcode of failed request: 73 (X_GetImage) Resource id in failed request: 0x48 Serial number of failed request: 184 Current serial number in output stream: 184 -> resolution in /etc/ssh/ssh_config Host * ForwardX11 yes ForwardX11Trusted yes With this parameters you can connect to all other systems and X11 forwarding works as default. Version-Release number of selected component (if applicable): openssh-clients-3.9p1-3 How reproducible: Sometimes Steps to Reproduce: 1. connect with ssh to other systems than RHEL4_BETA1 2. start a X11 program 3. Actual Results: X11 forwarding is not available by default Expected Results: X11 forwarding should be available by default Additional info: The new ssh_config parameters already comes with openssh version 3.8.
> -> resolution in /etc/ssh/ssh_config > Host * > ForwardX11 yes > ForwardX11Trusted yes Very Bad Idea(tm). X11 forwarding is being disabled by default because automatically doing it by default is insecure. (Red Hat should have changed their default to the upstream default a long time ago, but at least they're doing the right thing now.) Users can use the -X and -Y options to ssh as needed, or configuration files can be changed to automatically enable X11 forwarding on a per-host basis.
*** This bug has been marked as a duplicate of 137685 ***