Q: I'm not real sure what httptunnel can be used for exactly? A: It's a generic tool for sending data in and out through an HTTP proxy. This is not very useful in itself, so you must run another program which uses this data "tunnel". For example, you could use telnet to log in on a computer ouside the proxy. Q: httptunnel craches my SuSE 5.3 box, why? A: I don't know, but upgrading to 6.0 seems to help. Q: I'm responsible for network security in our company. My question is: are there any characteristics of the communication that may be detected at the proxy? A: Maybe. I make no guarantees. Use the source. Q: I wrote 'hts -d /dev/ptyq1' but 'cat </dev/ptyq1' returns an error. A: Use 'cat </dev/ttyq1' instead. Q: My friend runs hts at port 8888, but when I try to connect to it, there is no response. A: As for now, hts can't handle multiple tunnels. You must run your own instance of hts listening to another port. Q: Is there a Windows/95/98/NT version? A: It's possible to build and run httptunnel in the Cygwin environment. See http://sourceware.cygnus.com/cygwin/. Q: Are there binaries of httptunnel for win32(Windows/95/98/NT) anywhere? A: On the homepage, there is a link to someone maintaining win32 binaries. Q: Is there a Macintoch version? A: Not that I know of. Q: My firewall requires HTTP user authentication (which is currently not supported by httptunnel). Do you plan to add something like that? A: Yes. Q: How hard would it be to implement "hts" as a cgi running on a normal web server? A: hts can't be called directly from the HTTP server, because hts will service many connections during the lifetime of the tunnel. If the HTTP server executed a new instance of hts every time a new request was made, each new hts wouldn't have access to the prior state of the tunnel. However, a CGI proxy which forwards the requests to a normal hts listening to a port != 80 whould most probably be quite trivial to implement. Q: Have you thought of using HTTPS? A: It has been suggested, but I'd rather avoid all the nasty export restrictions. You can use external software to get an encrypted tunnel. Q: On REMOTE (brugd.ctrl-c.liu.se) I do the following: hts -F localhost:23 8888 This worked the first time, but never since... now I only get: hts: couldn't create tunnel A: The first hts is still running in the background. Q: On LOCAL (dhcp-XXX.enea.se) I do: htc -F 2323 -P http://internwebb/proxy2.pac:8000 brugd.ctrl-c.liu.se:8888 Now, I try: [root@localhost httptunnel-1.101]# telnet localhost 2323 Trying 127.0.0.1... telnet: Unable to connect to remote host: Connection refused A: [Christian Brideau] http://internwebb/proxy2.pac:8000 is not exactly the proxy's adress. This is the location of the Proxy-Auto-Configure (PAC) file. This file contains the adress of the proxy server. To discover the real adress, just go to an external web page using a browser and then use netstat to figure out what adress your browser is using. Q: Why does 'configure' fail on HP-UX? A: Because you haven't installed gcc. If CFLAGS=-O ./configure doesn't work, you must get gcc, or at least an ANSI C compiler.