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Opening a forwarded X11 connection over an SSH connection that's using a proxy fails to work. (Versions of PuTTY before 2002-10-11 may also crash.)
I (JTN) can reproduce this with HTTP proxying.
Appears to be occur regardless of whether there's an X server to connect to. When I do have an X server running, it doesn't appear to see any traffic when attempting X forwarding through a proxy.
Symptom is something like the following:
X connection to chiark:27.0 broken (explicit kill or server shutdown)
PuTTY behaves as though the X connection is being opened then slammed shut:
2002-10-17 18:07:24 Received X11 connect request 2002-10-17 18:07:24 opening X11 forward connection succeeded 2002-10-17 18:07:24 Opened X11 forward channel 2002-10-17 18:07:24 Forwarded X11 connection terminated
A workaround is to add `localhost,127.0.0.1' to the proxy exclusions. This implies that our proxying code is being over-enthusiastic and needs reining in.
Audit trail for this bug.