Bug 740017 - DisallowTCP=false appears broken in Fedora 15.
Summary: DisallowTCP=false appears broken in Fedora 15.
Alias: None
Product: Fedora
Classification: Fedora
Component: gdm
Version: 15
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Ray Strode [halfline]
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2011-09-20 17:40 UTC by Ben Greear
Modified: 2011-09-20 18:01 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2011-09-20 18:01:57 UTC
Type: ---

Attachments (Terms of Use)

Description Ben Greear 2011-09-20 17:40:51 UTC
Description of problem:

I want to be able to telnet to a remote system, set: export DISPLAY=foo:0.0,
and be able to run xterm and have it pop up on the local desktop.

Yes, I know ssh is better in many cases.

On Fedora 14 and earlier, one could add this to /etc/gdm/custom.com:


This appears to no longer work in Fedora 15.

Version-Release number of selected component (if applicable):

How reproducible:


Steps to Reproduce:
1. xhost +
2. telnet [remote-system]
3. export DISPLAY=[ip-of-local-system]:0.0
4  xterm&
5. xterm should display on local system.
Actual results:

xterm will not launch due to DISPLAY issues.

Expected results:

xterm should pop up on local system.

Additional info:

Appears to be regression..this worked on Fedora 13 and earlier, and I believe it worked on Fedora 14 as well.

Comment 1 Ben Greear 2011-09-20 18:01:57 UTC
Err, this appears to be some issue related to firewalls.  I used to use ntsysv
to disable the firewall, but while that sort of appears to work, it doesn't actually keep the iptables rules from being loaded.  So, that is the root cause of the X display not working.  With manual stop of iptables, it the DisallowTCP option works as desired.

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