This weekend I have to (want to) install eSignal-Software on Windows behind a Linux Firewall. It will collect data (real-time exchange-quotes) from different servers: "The communications between the client and server use both the "query-response" type and active/streaming technology (TCP). " First question, does anybody on this list has allreday experience with this (copy and paste some settings of firewall and/or squid?). The second question-part is about the power that has to have the firewall-pc (right now a little bit old) if squid is installed. - Does squid consume a lot 'power' memory and diskspace, what would be a recommandation? There is no need to save the data on the firewall for another pc. - The real-time data shold be handed to the program as soon as possible, of course. Now some questions about things I haven't heared so far. "You may use a proxy server if it is SOCKS v4, v4.3A or v5 compliant." Is that ok with Squid? This is a special note form the eSignal-site - what does this mean? How can I make the firewall/squid to 'toggle' between IP- and user-Identification? - Please note: eSignal applications do not support authentication queries from - the firewall/proxy server. It is strongly recommended that you use IP - authentication instead of user authentication; otherwise, the eSignal - application program on the client machine will not be able to access its - Internet servers. Thanks to all in advance, Carl