Server :: Forward VNC Requests From A To B?
Aug 18, 2010
I'm trying to forward VNC requests from server a to server b, acctually I need the server a to be just VNC proxy and other servers behind server a can be responsible for VNC requests.I did it with this iptables rule but it didn't workAnd for notification all VNC sessions of mine are in range of 59100 to 59199
num target prot opt source destination
1 DNAT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpts:59100:59199 to:bbb.bbb.bbb.bbb
Do you know a better way or a way to fix it with iptables?
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May 12, 2010
I have a server (Fedora 12) setup at a client's datacenter and the network is setup to allow me ssh access into the server, but prevents me from opening any connections from the server. However, I need to make http and https request from the server. What I'd like to do is forward all http/https traffic through another machine outside the network.
I've been looking at the documentation for ssh and the various options there and have gotten so far as to enable initiating an ssh connection from the client network back to my machine, but am not sure where to take it from there.
Here are some of the commands I've used so far:
Code:
I'm attempting to bind port 80 to be forwarded through the local machine. I assume I use "ssh -R" to create a dynamic tunnel to forward requests but I must be missing something.
By the way, root login via ssh is disabled.
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Feb 9, 2010
i have a web site and i need to forward all requests to the same page. Basically i would like to show a maintenance page while we are working with our database behind the application and in the meantime i would like to redirect all url in the root directory as following :
http:[url].....
http:[url]....
i tried to perform the action using mod_rewrite in this manner :
Code:
RewriteEngine On
RewriteRule . http://www.mysite.com [L][code].....
The webpage at http:[url]....has resulted in too many redirects. Clearing your cookies for this site or allowing third-party cookies may fix the problem. If not, it is possibly a server configuration issue and not a problem with your computer.
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May 18, 2010
I'm trying to make my wireless router always give me the same ip address every boot (192.168.1.100). I do not have a static ip address from my isp.
Everything I've tried from online help has made my internet break and I'm not even sure what exactly I should be searching for on google.
Ultimately, I'm trying to get my wireless router to forward ftp requests to my computer which shares the network with an xp machine. I think this is the way to go about it.
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Sep 1, 2011
I am making a content filter for a school. I have a computer with Ubuntu Server and the SOCKS proxy, a DD-WRT router, and a switch. how I could forward all requests through the SOCKS proxy before sending it to the Internet.
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May 4, 2011
How to forward local HTTP requests to remote Proxy with IPTables ?
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Apr 26, 2011
Here is my query:
Squid document says that Squid accepts only HTTP requests but speaks FTP on the server side when FTP object are requested.
We call Squid HTTP and FTP caching proxy server. Does it also caches FTP contents? Is it possible to configure FTP clients to use Squid cache? When we make an FTP request to an FTP site via Squid will it be bypassed?
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Aug 25, 2009
I have a home DNS server that has been working for some time today. Today I restarted to restarted it to clear the cache on it and now it refuses to answer and requests. Named starts fine with no errors. Here is named config file that worked for about 2 weeks fine and now doesn't want to work.
options {
directory "/etc";
pid-file "/var/run/named/named.pid";
forwarders {
192.168.1.10;
};
forward only;
};
zone "." {
type hint;
file "/etc/db.cache";
};
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Aug 15, 2010
I'm just asking about a script (ex, bash script) that will let me know how many requests to each website on the server? So is there a way to get know from shell how many requests or connections to each web site on the server, in order to determine which website is under flood or DoS/DDoS attack.
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Mar 30, 2010
I have an nfs server that is getting tons of mount requests, and i suspect it's becoming a performance issue. Even when noone is in the office I see mount/unmount requests in my logs. Is this normal?
/var/log/messages:
Mar 30 10:32:42 morgan mountd[29643]: authenticated unmount request from uranus:757 for /morgan/users (/morgan/users)
[code]....
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Dec 27, 2010
Background:I have a small PC104 running opensuse 11.1. I'm writing a small client/server application for debugging purposes using mono and WCF. All the client does is make a request for information every 100ms.Problem:After about 20 requests the server quits responding to the client. Even if the client is running on the same machine. I've run the exact code on another laptop running opensuse as well as a laptop running windows and everything works great. Hopefully that closes the option that it is a code, mono, or opensuse flaw.Is there a kernel option or a network option that anyone knows about that might cause this sort of behavior?
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Mar 12, 2011
I just installed primary dns server now want to install new slave server so that in case if primary fails secondary can take requests.
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Mar 20, 2011
We have a cisco ASA firewall at work,which redirects all http traffic to our webserver. We have to install a new website ,but it can't be installed to the same server. Setting up a squid reverse proxy can redirect the incoming http requests to the appropriate webserver? If yes, could I get some directions on howto?
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Nov 14, 2009
I'm working on a thorny mod_rewrite problem. I have a mac connected to my LAN running MAMP (Mac/Apache/MySQL/PHP). I request a non-existent file:
Code:
http://192.168.1.2:8888/careers/db/1.html
I see this in the mod_rewrite log file:
Code:
192.168.1.102 - - [14/Nov/2009:13:46:07 --0800] [192.168.1.2/sid#807df8][rid#8ec850/initial] (2) init rewrite engine with requested uri /careers/db/1.html
192.168.1.102 - - [14/Nov/2009:13:46:07 --0800] [192.168.1.2/sid#807df8][rid#8ec850/initial] (1) pass through /careers/db/1.html
Note that the requested uri is /careers/db/1.html
If I change just the file extension on my request to PHP like so:
Code: [URL]
Then the request uri is totally different now. Here's the rewrite log:
Code:
192.168.1.102 - - [14/Nov/2009:13:47:23 --0800] [192.168.1.2/sid#807df8][rid#8fc850/initial] (2) init rewrite engine with requested uri /Applications/MAMP/htdocs/careers/
192.168.1.102 - - [14/Nov/2009:13:47:23 --0800] [192.168.1.2/sid#807df8][rid#8fc850/initial] (1) pass through /Applications/MAMP/htdocs/careers/
Note that the requested uri now has a full path which does not include the actual filename, /Applications/MAMP/htdocs/careers/
What the heck? More info. If I request [URL], I can actually access p1.php. The requested uri is /careers/db/p1.php. The problem appears to be because the filename starts with a number. I can also request [URL] and get thru to 1.php with requested uri /careers/db//1.php. Does mod_rewrite think /1 refers to a backreference or something? Why can apache handle the html file request properly and not the php file request?
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Jun 26, 2010
1-Can I have the shell command which allows me to have the number of reques ts/seconds under the Apache server?
2-And the number of sons threads in service/wait?
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Oct 17, 2010
I run a small home server (Debian 4), which acts as my gateway to the internet (ie, firewall) and runs a web server, dhcp, dns, and acts as a file server to the rest of the machines on my home network. Now I know it's never a smart idea to have all those services running on the same machine that is acting as a firewall, but I don't fancy running multiple servers just for home use, as it's mainly allowing me to learn system administration.
I noticed a few days ago that my internet had become unbearably slow, to the point where I could sometimes not load web pages. I spent a while searching through log files on my gateway, to try and find out what was eating up all of my bandwidth. When I came to apache's access.log file, I was confronted with this:
Code:
204.45.41.82 - - [17/Oct/2010:06:25:10 +0100] "GET http://vewice6.nightmail.ru/marriott-grand-cayma.html HTTP/1.1" 200 36921 "-" "Mozilla/4.0 (compatible; M$
204.45.41.82 - - [17/Oct/2010:06:25:11 +0100] "GET http://malaysiapodcaster.blogspot.com/2006/05/blog-post_11.html HTTP/1.1" 200 58681 "-" "Mozilla/4.0 (com$
[code]........
Multiple requests to my server, for totally random websites. I didn't even know it was possible to make those types of queries to a webserver. The only thing that is on the web server is a browser based torrent client. I have only shown a small snippet of the log file, but there are around 90k lines to different web addresses, from many different IPs. What I want to know, is what is happening? :S Why is someone querying MY web server, for web sites totally unrelated to it? And most of all, how can I stop it. My initial was to try and use iptables to block multiple requests from the same ip within a certain time frame, which I think would work as the server shouldn't really get many queries from external networks.
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Apr 1, 2011
On my server I provide OCR file conversion service but the problem is when a user uploads a file and it's being converted then if you open another tab and try to load the site it won't respond until that conversion is completed. In other words until the PHP script finishes execution apace doesn't serve any other request to the same browser.
Here is my apache configuration:
Code:
ServerTokens OS
ServerRoot "/etc/httpd"
PidFile run/httpd.pid
[code]....
You can check what I mean if you try to upload and convert a file and while the file is converting try opening the site in another tab.
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Dec 28, 2010
I've had a VPS running Ubuntu 9.10 x64 server, hosting 3 websites of mine for a few months now. This problem has been happening for a while. Every once in a while, probably every 2 or 3 days, I'll wake up in the morning, and apache won't be responding, no web pages will load. /etc/init.d/apache2 status, reports that apache is functioning properly. Every time I simply have to restart the daemon and things run fine for another few days.
I thought maybe it was a memory issue, so I lowered the MaxClients in the prefork module from 50 to 30 a few days ago, but the same thing is still happening. My VPS has 512MB of ram, burstable to 1GB, and according to Virtuozzo, there was only one night of high traffic where I even came close to that soft limit. I've checked my syslog, and there's absolutely nothing in there about apache. I've checked apache's error.log as well, and there's nothing in there that would indicate a problem either.
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Mar 10, 2011
For one project I use a web hosting service. I wanted the entire site to be https, so I bought a service from them in which they automatically install a trusted cert so people can access the site through https protocol. Since http is still available, though, I need to do automatic rewrites or something to change http into https requests. (I don't have access to their Apache server configuration files or anything like that.)I found on the net this code to add to my .htaccess file:
Code:
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
[code]....
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Apr 12, 2011
I have a perfectly working installation of nginx / PHP / fastcgi on the latest stable Debian distribution. No problems at all, apart from this one: When a PHP script (script A) is written to request a PHP script on the same web server (script B), nginx takes several minutes to respond and finally the connection times out. And it happens only when invoking script A through nginx. Calling it from command line works fine � I get a normal output of script B.
Literally, the test case is as simple as:
Script A:
PHP Code:
[code]....
I suppose the root of the problem may be some obstacle occurring when php5-cgi ends up invoking itself. And this is what happens when script A is called through nginx. But I have no ideas yet how to address the problem. One of my PHP applications checks itself during installation, that's why I need to request a PHP script from a PHP script on the same server.
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Jan 5, 2011
i have configured sendmail server in my lan and it is working fine for me.but there is one little problem for me. i want mails send sunita should be received by vinita.sunita and vinita both are normal users on same pc.
for this i made entry in
Code:
/etc/aliases sunita: vinita
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Jan 6, 2010
I have installed bootpd-dd2 and enabled and configured it with xinetd. 1. Made sure that their is a bootptab file and it is configured. 2. Tested the bootpd is working by runing the command /usr/sbin/bootptest cmdbfs .3. tail -f the /var/log/messages and saw the requests from the test.4. rebooted a machine that is configured to pxe boot.there is no messages by bootpd when a request is made.request is picked up by network monitor on a seperate computer on the proper udp port
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Apr 16, 2010
I recently set up a new web/file server with 9.10 server x64 with 2 NICs and I am trying to configure eth0 to respond to my LAN for internal samba filesharing and eth1 to handle website/ftp requests on my static IP, but whenever eth0 is up the server is not accessible at 173.XX.165.65 for web or ftp but both work fine at 10.1.10.100. When eth0 is down, public IP works fine. I have set /etc/network/interfaces like this:
Code:
# The primary network interface
auto eth0
iface eth0 inet static
address 10.1.10.100
[Code].....
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Apr 21, 2011
I'm having an issue with a Samba server running on an Ubuntu "server". Technically, it's not a server, it's just an old desktop with Ubuntu 10.04 running it..and I have a few server processes running (ProFTP, Samba, etc.)The Ubuntu server is where I store all of my important files that get backed up to a separate hard drive. I shared folders via Samba, and I use two computers to access the shares. I access the shares with an .sh file I created that uses the mount cifs command to mount to those shares.
It has been working flawlessly for a long long time, up until recently. For the past few days to a week, I will try to mount the shares with no result. In the terminal, the commands just freeze, as if the command is trying to execute, but having network issues.The only way I can get it to work is if I reboot the Ubuntu server, then it maps flawlessly. But a day later, it's back to hanging up when trying to mount.
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Mar 18, 2010
A Linux (CentOS5.3) server is setup with apache reverse proxy. The reverse proxy server is opened to outside and an internal server is mapped to ProxyPass configuration. SSL certificate is also installed on the Apache reverse proxy server. The problem is, it is extremely slow in serving http requests through reverse proxy. There is no problem with server resources or bandwidth. When the internal server is directly accessed through Internet, there is no delay. The backend server and the reverse proxy server are also on the same switch (same subnet). When I searched the Net, there were recommendations to enable cache in Apache. I did so as follows in httpd.conf.
<IfModule mod_disk_cache.c>
CacheEnable disk /
CacheRoot "/var/cache/mod_proxy"
CacheDirLevels 5
CacheDirLength 3
</IfModule>
But still there is no progress. Do I want to enable cache in ssl.conf too? Or is there any other workaround to speed up Apache reverse proxy. Is there a way to check that caching is happening?
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Apr 17, 2010
my server runs fedora 12 i686 LXDE and has an 80 gig hd.on ftp i have a high volume of files that do not fit on the 80 gig hd, however if i could somehow connect to a lan fileserver on the lan and make it accessible through the server, all my problem would be solved. how do i do this?the reason i dont attach more HD's to the server is that all my hard drives are sata and the server doesnt support this
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Jul 5, 2011
I would like configure a DNS server on Debian, only to forward through my ISP DNS servers.
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Dec 24, 2008
So here is my issue in a nutshell. I need to take FTP requests that hit Server_A and forward them to Server_B. Server_B is not natted...Server_B is another public server in a completely different location in the world. One thing to note is that I only have one NIC hence why you will see both in and out being eth0. This is what I have in my iptables on SERVER_A:iptables -A FORWARD -p tcp -i eth0 --sport 21 -o eth0 -d SERVER_B --dport 21 -m state --state NEW -j ACCEPTiptables -A FORWARD -p tcp -i eth0 --sport 20 -o eth0 -d SERVER_B --dport 20 -m state --state NEW -j ACCEPTI've also tried both of the above without the --sport option. When I FTP to SERVER_A (where the above iptables rule are) it connects to SERVER_A instead of forwarding them to SERVER_B.
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Jul 22, 2011
my company is a small company!and it only have one public ip,but my company have a lot of websites to access!now i use Reverse Proxy Server -- apahce to solve temporary!it is not convenience for me !So i think out whether iptables can not be used to forward according to the domain!!it is the test as follows:
public ip :10.0.0.1
privite ip1 :192.168.1.1
matching website domain:www1.test.com
privite ip2:192.168.1.2
matching website domain:www2.test.com
and if someone access [URL] the iptables will know they want to access 192.168.1.1 and it will forward to the server 192.168.1.1!!
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Feb 9, 2011
Just setup an ssh server...kinda. I need to forward the port (22) through my router. I have forwarded ports before for programs so the whole thing isnt a mystery. But i need to know what to put in for a couple boxes.... Private ip: ? protocol type: tcp, udp, or both?
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