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...ion of IPv6 addresses. The resulting error produces an error message which can be attributed to the debug2 statement later in that function (line 3582): connect 2001 port 6006: Invalid argument Error: Can't open display: localhost:10.0 A workaround is documented here: http://www.technologische-hilfe.de/antworten/lightdm-xdm-sitzung-und-ipv6-support-241428392.html My guess is that the problem can be solved by using strrchr in that statement: cp = strrchr(buf, ':'); -- You are receiving this mail because: You are watching the assignee of the bug.