$ xemacs -vanilla (open-network-stream "bug" nil "10.0.0.42" 42) Now XEmacs 21.1 (and 20.4) is hung, C-g doesn't do anything. XEmacs 21.2 seem fine. Perhaps the solution used there could be back-ported to XEmacs 21.1? (The 10.0.0.42 address should be chosen so that you don't get ANY responses from the host, including ICMP. "telnet 10.0.0.42" should hang indefinitely.) Aborting with C-c: Lisp backtrace follows: open-network-stream-internal("bug" nil "10.0.0.42" 42) # bind (coding-system-for-read coding-system-for-write cs-r cs-w service host buffer name) open-network-stream("bug" nil "10.0.0.42" 42) eval((open-network-stream "bug" nil "10.0.0.42" 42)) # bind (expr) eval-interactive((open-network-stream "bug" nil "10.0.0.42" 42)) # bind (standard-output opoint ignore-quotes eval-last-sexp-arg-internal) eval-last-sexp(t) # bind (standard-output) #<compiled-function nil "...(20)" [standard-output terpri eval-last-sexp t] 2 908822 nil>() call-interactively(eval-print-last-sexp) # (condition-case ... . error) # (catch top-level ...)