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UNIX for Advanced & Expert Users
SSH Tunneling
Post 302108589 by silvaman on Tuesday 27th of February 2007 02:45:38 PM
02-27-2007
SSH Tunneling
Hi all
question -
there are 2 servers A + B. server A is connected to the internet and running a squid proxy server - server B is behind a firewall. I can ssh from A to B but not from B to A. I need internet access on B to update some files. I thought I could use some sort of ssh tunnel to achieve this.
I was thought a remote port forward from A to B. I configured this ( from server A do 'ssh -R 1234:squidproxy_ipaddress:3128 user@server_B) and got a http 403 error when doing the update on B and pointing at localport 1234 which , i thought, indicated a permissions issue on the squid proxy no problem to sort out - except i dont have permissions to do it
- the sysadmin can sort it out though
however
The sysadmin says it wont work I should be doing a local port forward on A - i configured this (ssh -L:localhost:3128 user@serverB) and got a 'connection refused error' when doing the update from server B
its not resolved yet as sysadmins unavailable but out of curiosity who is right here - these tunnels can get a bit confusing! - thoughts appreciated as always
question -
there are 2 servers A + B. server A is connected to the internet and running a squid proxy server - server B is behind a firewall. I can ssh from A to B but not from B to A. I need internet access on B to update some files. I thought I could use some sort of ssh tunnel to achieve this.
I was thought a remote port forward from A to B. I configured this ( from server A do 'ssh -R 1234:squidproxy_ipaddress:3128 user@server_B) and got a http 403 error when doing the update on B and pointing at localport 1234 which , i thought, indicated a permissions issue on the squid proxy no problem to sort out - except i dont have permissions to do it
- the sysadmin can sort it out thoughhowever
The sysadmin says it wont work I should be doing a local port forward on A - i configured this (ssh -L:localhost:3128 user@serverB) and got a 'connection refused error' when doing the update from server B
its not resolved yet as sysadmins unavailable but out of curiosity who is right here - these tunnels can get a bit confusing! - thoughts appreciated as always
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LEARN ABOUT LINUX
cachemgr.cgi
cachemgr.cgi(8) System Manager's Manual cachemgr.cgi(8) NAME
cachemgr.cgi - squid HTTP proxy manager interface SYNOPSIS
http://your.server/cgi-bin/cachemgr.cgi DESCRIPTION
The cache manager (cachemgr.cgi) is a CGI utility for displaying statistics about the Squid HTTP proxy process as it runs. The cache man- ager is a convenient way to manage the cache and view statistics without logging into the server. FILES
./cachemgr.conf @DEFAULT_CACHEMGR_CONFIG@ The access configuration file defining which Squid servers may be managed via this cachemgr.cgi program. Each line specifies a server:port followed by an optional description The server name may contain shell wildcard characters such as *, [] etc. A quick selection dropdown menu is automatically con- structed from the simple server names. Specifying :port is optional. If not specified then the default proxy port is assumed. :* or :any matches any port on the target server. SECURITY
cachemgr.cgi calls the requested server on the requested port using HTTP and returns a formatted version of the response. To avoid abuse it is recommended to configure your web server to restrict access to the cachemgr.cgi program. Configuration examples for many common web servers can be found in the Squid FAQ. SEE ALSO
squid(8) The Squid FAQ, Chapter 9 The Cache Manager Squid Web Proxy 3.1.20 cachemgr.cgi(8)