+ * sent with want_reply false, are sent before this handler gets
+ * installed, or are "winadj@putty" requests, which servers should
+ * never respond to with success.
+ *
+ * However, at least one server ("boks_sshd") is known to return
+ * SUCCESS for channel requests it's never heard of, such as
+ * "winadj@putty". Raised with foxt.com as bug 090916-090424, but
+ * for the sake of a quiet life, we handle it just the same as the
+ * expected FAILURE.