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Some HTTPS connections via NAT fail, but work on firewall itself.

- by hnxn

Hi, I am having trouble establishing some HTTPS connections from internal machines, even though these same connections work if initiated on the firewall itself. The firewall machine is running Ubuntu 10.04.1 and shorewall 4.4.6. The internet connection is Bell PPPoE DSL (in Canada). I have tried various MTU settings, it doesn't seem to make any difference. Other protocols (HTTP, FTP, etc) generally work. The problem seems to be limited to certain sites; this one never works from an internal machine, but always works from the firewall itself: From internal machine: $ wget https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif --2011-01-13 20:51:31-- https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif Resolving images.fedex.com... 184.24.96.69 Connecting to images.fedex.com|184.24.96.69|:443... connected. ^C From firewall: $ wget https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif --2011-01-13 20:58:28-- https://images.fedex.com/images/ascend/shared/headers/nxgen/corp_logo.gif Resolving images.fedex.com... 184.24.96.69 Connecting to images.fedex.com|184.24.96.69|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 840 [image/gif] Saving to: `corp_logo.gif' 2011-01-13 20:58:28 (149 MB/s) - `corp_logo.gif' saved [840/840] This URL always works from both internal and firewall: https://encrypted.google.com/images/logos/ssl_logo_lg.gif Any troubleshooting tips would be greatly appreciated!

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Accessing my Rails webrick behind proxy?

- by Eki Eqbal

In my mackbook, when I try to connect to my rails application in office I can't , in the office there are some http proxy , and when I run my rails like this : sudo rails s -p8080 => Booting WEBrick => Rails 3.0.5 application starting in development on http://0.0.0.0:8080 => Call with -d to detach => Ctrl-C to shutdown server [2012-03-20 12:49:34] INFO WEBrick 1.3.1 [2012-03-20 12:49:34] INFO ruby 1.8.7 (2010-01-10) [universal-darwin11.0] [2012-03-20 12:49:34] INFO WEBrick::HTTPServer#start: pid=17439 port=8080 The local IP is : en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether f8:1e:df:d8:8c:25 inet6 fe80::fa1e:dfff:fed8:8c25%en1 prefixlen 64 scopeid 0x5 inet 10.21.21.240 netmask 0xffffff00 broadcast 10.21.21.255 media: autoselect status: active so when I try in the browser to trigger localhost:8080 or 10.21.21.240:8080 , it seems that I can't trigger my application as for the proxy check out the following : Any Ideas ?

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VirtualBox - Mac OSX host Win7 guest - no Internet access for guest VM

- by nodelayheehoo

I have a Mac running OSX 10.9.2, and I just downloaded and installed a Win7 IE9 VM in VirtualBox. My Mac uses Wi-Fi for internet access, and it's behind a proxy (it's a work machine). VirtualBox loads the VM fine, and at some point the VM can see the DNS servers of the host. But I've never been able to make the VM have internet access. I've tried all kinds of combinations of Network settings on the VM via the VirtualBox Settings, in conjunction with Internet Sharing in OSX's System Preferences, but no luck. Has anyone done a similar setup and made the VM successfully connect to the Internet? Thanks in advance for any inputs. [ Update: I was able to get internet access for the VM when the host was using my home network. When I ran the VPN software to connect to the work network, the internet access went away again.] (Initially posted this on stackoverflow.com, but it was put on hold as off-topic by several users, and was advised to ask here instead)

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In Ubuntu, MoBlock makes it take a while to actually start using internet

- by Matchu

When connecting to wireless internet in Ubuntu (tested with two different networks), I connect nearly instantly. However, to actually load a page, I need to wait a few minutes, at which point I can actually use a web browser or Pidgin. Until then, various applications try to connect until they time out. I've discovered that, if instead of waiting a few minutes, I open Terminal and run sudo /etc/init.d/blockcontrol stop, everything suddenly is able to load. I can then start MoBlock again with no ill effects. Why is this happening? What is it that would cause MoBlock to take a few minutes to start letting traffic in, but only when started on bootup? Thanks!

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Linux Bridge, Samba netbios name/hostname access

- by Christopher Wilson

I am currently running a linux bridge in the following configuration ADSL Modem: 192.168.1.1 Linux Bridge: eth0: 192.168.1.2 eth1: no address Wireless Router: 192.168.0.1 My issue is that i cannot access the "Linux Bridge" shares using the WINS name of the server via client systems (yes i understand it is a transparent bridge but i can access it via the 192.168.1.2 address this is not on the same subnet as the client systems). This is the global section of my SMB.CONF [global] unix extensions = off os level = 20 netbios name = server guest account = nobody server string = 447 Server security = share #unix extensions = no #wins support = yes #wins server = 192.168.0.1 name resolve order = wins lmhosts hosts bcast interfaces bridge1 eth0 eth1 lo bind interfaces only = yes Can i access a bridged server using it's WINS name to access samba shares? Cheers Chris

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Smoothwall Express interface issues

- by Timbermar

I have a SmoothWall Express box that is currently configured with a Green and Purple interface. Both interfaces are in the same /24 subnet (which seems odd to me). The green interface (address of .254) has a DHCP server that is pushing addresses from .1 to .100 and the purple interface (.253) is pushing addresses from .101 to .120. Every machine here is trusted, and as such is connected to the green interface via a wired connection or wireless APs. Nothing is connected at all (port is physically empty, traffic graphs show no activity) to the purple interface. However, every machine here is pulling addresses from the purple interface. So the question boils down to, how do I remove/stop my machines from pulling from the purple dhcp interface? Also, shouldn't the purple interface (if we were using it for guest Wifi or something) be on a different subnet (i.e. 192.168.100.0/24 instead of 192.168.1.0/24 with all the trusted machines)?

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How can I debug a port/connectivity issue?

- by rfw21

I am running a simple WebSocket server on Amazon EC2 (Fedora Core). I've opened the relevant port using ec2-authorize, and checked that it's opened. Iptables is definitely not running. However I can't connect to the port from outside EC2. I've tried the following (my server is running on port 7000): telnet ec2-public-dns.xx.xx.xx.amazon.com 7000 (from within EC2: connects fine) nmap localhost (output includes line: 7000/tcp open afs3-fileserver) telnet ec2-public-dns.xx.xx.xx.amazon.com 7000 (this time from my local machine: I get "connection refused: Unable to connect to remote host") The strange thing is this: if I start Nginx on port 7000 then it works and I can connect from outside EC2! And the WebSocket server fails on port 80, where Nginx works fine. To me this suggests a problem with the WebSocket server, BUT I can connect to it successfully from within EC2. (And it works fine on a different VPS account). How can I debug this further? If anybody can stop me tearing my hair out, I'd be very grateful indeed :)

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iptables blocking ssh communication

- by Michal Sapsa

I'm using this script for iptables: #!/bin/sh echo "1" > /proc/sys/net/ipv4/ip_forward iptables -F iptables -X iptables -F -t nat iptables -X -t nat iptables -F -t filter iptables -X -t filter iptables -t filter -P FORWARD DROP iptables -t filter -A FORWARD -s 192.168.0.0/255.255.0.0 -d 0/0 -j ACCEPT iptables -t filter -A FORWARD -s 0/0 -d 192.168.0.0/255.255.0.0 -j ACCEPT iptables -t nat -A POSTROUTING -s 10.8.0.1/255.255.255.0 -j MASQUERADE iptables -A FORWARD -s 10.8.0.1/255.255.255.0 -j ACCEPT iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -d 0/0 -j MASQUERADE iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu iptables -t nat -A PREROUTING -i eth1 -p udp --dport 16161 -j DNAT --to 192.168.0.251:16161 iptables -t nat -A PREROUTING -i eth1 -p udp --sport 16161 -j DNAT --to 192.168.0.251:16161 #openvpn iptables -I INPUT -p tcp --dport 1194 -j ACCEPT iptables -I INPUT -p udp --dport 1194 -j ACCEPT I end up with some iptables rules that should work but don't work - probably because of me. # Generated by iptables-save v1.4.12 on Mon May 26 13:15:43 2014 *raw :PREROUTING ACCEPT [1657523:1357257330] :OUTPUT ACCEPT [36804:34834370] -A PREROUTING -p icmp -j TRACE -A PREROUTING -p tcp -j TRACE -A OUTPUT -p icmp -j TRACE -A OUTPUT -p tcp -j TRACE COMMIT # Completed on Mon May 26 13:15:43 2014 # Generated by iptables-save v1.4.12 on Mon May 26 13:15:43 2014 *nat :PREROUTING ACCEPT [5033:345623] :INPUT ACCEPT [154:34662] :OUTPUT ACCEPT [6:1968] :POSTROUTING ACCEPT [2:120] -A PREROUTING -i eth0 -p tcp -m tcp --dport 16161 -j DNAT --to-destination 192.168.0.251:22 -A PREROUTING -i eth1 -p tcp -m tcp --dport 16161 -j DNAT --to-destination 192.168.0.251:22 -A POSTROUTING -s 10.8.0.0/24 -j MASQUERADE -A POSTROUTING -s 192.168.0.0/24 -j MASQUERADE COMMIT # Completed on Mon May 26 13:15:44 2014 # Generated by iptables-save v1.4.12 on Mon May 26 13:15:44 2014 *filter :INPUT ACCEPT [548:69692] :FORWARD DROP [8:384] :OUTPUT ACCEPT [2120:1097479] -A INPUT -p udp -m udp --dport 1194 -j ACCEPT -A INPUT -p tcp -m tcp --dport 1194 -j ACCEPT -A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu -A FORWARD -s 192.168.0.0/16 -j ACCEPT -A FORWARD -d 192.168.0.0/16 -j ACCEPT -A FORWARD -s 10.8.0.0/24 -j ACCEPT -A FORWARD -i eth0 -o eth1 -p tcp -m tcp --dport 22 -j ACCEPT -A FORWARD -i eth1 -o eth0 -p tcp -m tcp --dport 22 -j ACCEPT COMMIT TRACE at PREROUTEING AND OUTPUT are only for debuging this thing. When I ssh at public ip with port 16161 I don't get any message, only TimeOut so it looks like I don't get communication back to remote server. ETH0 is the world, ETH1 is LAN Any IPTABLES Masters willing to give a hand ? iptables -vL Chain INPUT (policy ACCEPT 20548 packets, 3198K bytes) pkts bytes target prot opt in out source destination 38822 7014K ACCEPT udp -- any any anywhere anywhere udp dpt:openvpn 0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:openvpn Chain FORWARD (policy DROP 1129 packets, 64390 bytes) pkts bytes target prot opt in out source destination 214K 11M TCPMSS tcp -- any any anywhere anywhere tcpflags: SYN,RST/SYN TCPMSS clamp to PMTU 4565K 1090M ACCEPT all -- any any 192.168.0.0/16 anywhere 5916K 7315M ACCEPT all -- any any anywhere 192.168.0.0/16 0 0 ACCEPT all -- any any 10.8.0.0/24 anywhere 0 0 ACCEPT tcp -- any any anywhere 192.168.0.251 tcp dpt:16161 Chain OUTPUT (policy ACCEPT 59462 packets, 19M bytes) pkts bytes target prot opt in out source destination

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Linux server cannot be pinged

- by misamisa

I have set up a Linux server in DMZ. There is another Windows server running in same DMZ. These two servers can be pinged via internet using my home PC. However, the another Linux server rented from a hosting service provider can only be pinged from the Windows Server and not from the Linux server (accessed via internet). So the situation is: Windows server (DMZ) ---ping--- Rented Server.....Successful Linux server (DMZ) ---ping--- Rented Server.......Unreachable Home PC ---ping--- Linux server (DMZ).......Successful Home PC ---ping--- Windows server (DMZ).....Successful When I ran tcpdump on my Linux Server(DMZ) and started ping from Rented Server, it showed that the Linux Server(DMZ) is receiving ping and replying. There is no restriction defined in hosts.deny and hosts.allow file that might cause this problem. What else should I check to get this working?

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Access denied error 3221225578 with file sharing to Windows server

- by Ian Boyd

i'm trying to access the shares on a server. The credential box appears, and i enter in a correct username and password, and i get access denied. The silly thing is that i can Remote Desktop to the server (using the same credentials), and i can check the Security event log for the access denied errors: Event Type: Failure Audit Event Source: Security Event Category: Account Logon Event ID: 681 Date: 3/19/2011 Time: 11:54:39 PM User: NT AUTHORITY\SYSTEM Computer: STALWART Description: The logon to account: Administrator by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0 from workstation: HARPAX failed. The error code was: 3221225578 and Event Type: Failure Audit Event Source: Security Event Category: Logon/Logoff Event ID: 529 Date: 3/19/2011 Time: 11:54:39 PM User: NT AUTHORITY\SYSTEM Computer: STALWART Description: Logon Failure: Reason: Unknown user name or bad password User Name: Administrator Domain: stalwart Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: HARPAX Looking up the error code (3221225578), i get an article on Technet: Audit Account Logon Events By Randy Franklin Smith ... Table 1 - Error Codes for Event ID 681 Error Code Reason for Logon Failure 3221225578 The username is correct, but the password is wrong. Which would seem to indicate that the username is correct, but the password is wrong. i've tried the password many times, uppercase, lowercase, on different user accounts, with and without prefixing the username with servername\username. What gives that i cannot access the server over file sharing, but i can access it over RDP?

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What's the closest equivalent of Little Snitch (Mac program) on Windows?

- by Charles Scowcroft

I'm using Windows 7 and would like to have a feature like Little Snitch on the Mac that alerts you whenever a program on your computer makes an outgoing connection. Description of Little Snitch from its website: Little Snitch informs you whenever a program attempts to establish an outgoing Internet connection. You can then choose to allow or deny this connection, or define a rule how to handle similar, future connection attempts. This reliably prevents private data from being sent out without your knowledge. Little Snitch runs inconspicuously in the background and it can also detect network related activity of viruses, trojans and other malware. Little Snitch provides flexible configuration options, allowing you to grant specific permissions to your trusted applications or to prevent others from establishing particular Internet connections at all. So you will only be warned in those cases that really need your attention. Is there a program like Little Snitch for Windows?

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How do I block IP addresses in SuSEFirewall?

- by Evgeny

Does SuSEfirewall in OpenSuSE 11 provide an easy way to block all traffic from a list of IP addresses? Ideally just a textfile into which I can put all IP addresses I want blocked, otherwise some configuration option. I've looked through /etc/sysconfig/SuSEfirewall2, but haven't been able to find anything like that.

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install remote desktop in a PC with FTP and HTTP access

- by user39862

Hi, I have a machine behind a firewall to which I have only FTP and HTTP access - is there any remote desktop software available that I can install over FTP and access over HTTP (java based perhaps)? The reason I'm asking is because ultraVNC stopped working for no reason and I need to access the PC (it has installed windows 7 with UAC disabled). thanks

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install remote desktop in a PC with FTP and HTTP access

- by user39862

Hi, I have a machine behind a firewall to which I have only FTP and HTTP access - is there any remote desktop software available that I can install over FTP and access over HTTP (java based perhaps)? The reason I'm asking is because ultraVNC stopped working for no reason and I need to access the PC (it has installed windows 7 with UAC disabled). thanks

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Access Other Computer via ADSL Modem and Router

- by Sohail

My network configuration is like this ISP - Modem - Router - Computer and the same goes for my friend. We want to share large files or to access each other's computer. The Passwords to login to the web page of each other modems are known. I mean, we can access each other Modem Web GUI easily ( because we know the WAN IP of each other modem ). The question is how do i access his or how do he access my computer? Is there any way to do so. Remote desktop connection is not working :( Please help

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How long does a blocked connection from Iptables last? Is there a way to set the timeout?

- by Josh

iptables -A INPUT -m state --state NEW -m recent --set # If we receive more than 10 connections in 10 seconds block our friend. iptables -A INPUT -m state --state NEW -m recent --update --seconds 5 --hitcount 15 -j Log-N-Drop I have these two relevant rules from iptables. if more than 15 connections are made in 5 seconds it logs the attempt and blocks it. How long does iptables maintain the counter? Does it refresh if connections are attempted again?

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ftp server offering http access ?

- by MikeJ

Is there an FTP server that can also provide access via HTTP? Or what do I need to do to set up the mirror of FTP through HTTP access ? Some of my clients cannot access our FTP because of corporate policy and cannot get updates from me. However, they can use HTTP. Currently I use filezilla because it was fast/easy to set up but would switch to something with more flexibility.

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What ports do I need open for IMAP connections

- by iamjonesy

I'm developing a web application that connects to an IMAP mailbox and fetches emails as part of it's functionality. The application is PHP and I'm connecting like this: public function connect() { /* connect to gmail */ $hostname = '{imap.gmail.com:993/imap/ssl}INBOX'; $username = $this->username; $password = $this->password; /* try to connect */ $this->inbox = imap_open($hostname,$username,$password) or die('Cannot connect to Gmail: ' . imap_last_error()); } Developing locally on my mac this was fine, I was able to connect and get emails. However now that I've put the app on my web hosts server I'm getting the following error: Cannot connect to Gmail: Can't connect to gmail-imap.l.google.com,993: Connection timed out After checking with my hosting provider they told me outgoing connections on port 993 are blocked. Is there anyway around this? Otherwise I need to upgrade to a dedicated server :S

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Guest can't access host windows network share

- by Asteroza

HI folks, I've recently run into a strange problem after upgrading to VMware player 3. Certain virtual machines (currently an XP and a VIsta VM) seem to have lost the ability to access the host (XP) network shared folders (SMB). Both VM machines are bridged networking, firewall is up. Host firewall is up. Host and guests use DHCP. All OS are workgroup connected. The Vista VM I am not completely sure, but the XP VM did have access to the host's network shared folders after the player upgrade. Then today it wouldn't work, network path can't be found. Now here's the wierd part. The host's network shared folders can be accessed properly by other PC's on the network (and as far as I know, no settings have been changed). The host is pingable from the guests, and name resolution works. The guests can access network shares on other PC's in the network, and access the internet. My Network Places shows the host PC, but double clicking on it takes a long time before it finally times out with an error. Doing a wireshark packet capture, the guest is sending out the protocol negotiation, and the host is sending a response, but after that the guest behaves like it didn't receive anything and is doing TCP retransmissions. Anybody have any idea what could be wrong? Yes I know I can drag and drop files or setup the special VMware shared folders, but I want to access the host just like any other network accessible shared folder. It just seems really odd when any other computer works, just not between the guest and host.

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Nginx Forward SSL for single site

- by Will.brown

I have a nginx server setup and it works fine for http however i would like to bypass the proxy for https connection. I want it so that when someone goes to my ip https:// ip1 (Nginx server) it bypasses ngix and forwards all traffic to https:// ip2(webserver) i do not need ngix to do this for any ssl website just one particular website. SO Client to https:// ip1 to https:/ /ip2 to https:// ip1 to client pc I just want the nginx to not intercept the connection and forward it on and on return forward the connection to client Im guessing i do this by nat mascarade buy not exactly sure how to do it and if i will need to tell nginx to ignore ssl aswell can someone help me please this has gone me stuck

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IIS 7.5 Warning : Cannot verify access to the path

- by Mostafa

I'm newbie in IIS 7.5 , Before this I used to run ASP.NET Website under IIS 5 , That was too easy . I'm trying to run a very simple asp.net website ( just created a new website from VS 2010 targeted in .net 3.5) in IIS 7.5.7600 on windows 7 Ultimate 64 bit . While adding application , during Test Setting i receive one warning that says : The server is configured to use pass-through authentication with a built-in account to access the specified physical path. However, IIS Manager cannot verify whether the built-in account has access. Make sure that the application pool identity has Read access to the physical path. If this server is joined to a domain, and the application pool identity is NetworkService or LocalSystem, verify that \$ has Read access to the physical path. Then test these settings again But I don't know how to make sure application pool identity has read access to the physical path ? I'm wondering if there is any step by step article or some thing that show me the walk-though for running a simple asp.net website on IIS 7.5? I appreciate any help .

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Terminal Server 2008 Login: Access Denied

- by user1236435

When I try to RDP into a Server 2008 Terminal Server, I get a message that says "Access Denied" and an OK button. I setup the licensing mode correctly (per user) and also have setup to allow all remote connections. I get the following in the security event log: Log Name: Security Source: Microsoft-Windows-Security-Auditing Date: 28/06/2012 12:01:16 Event ID: 4656 Task Category: File System Level: Information Keywords: Audit Failure User: N/A Computer: 0BraApps1.brenntagLA.hou Description: A handle to an object was requested. Subject: Security ID: BRENNTAGLA\jaadmin Account Name: jaadmin Account Domain: BRENNTAGLA Logon ID: 0xbbe3f Object: Object Server: Security Object Type: File Object Name: C:\Windows\System32\ServerManager.msc Handle ID: 0x0 Process Information: Process ID: 0x60c Process Name: C:\Windows\System32\mmc.exe Access Request Information: Transaction ID: {00000000-0000-0000-0000-000000000000} Accesses: READ_CONTROL SYNCHRONIZE WriteData (or AddFile) AppendData (or AddSubdirectory or CreatePipeInstance) WriteEA ReadAttributes WriteAttributes Access Reasons: READ_CONTROL: Granted by D:(A;;0x1200a9;;;BA) SYNCHRONIZE: Granted by D:(A;;0x1200a9;;;BA) WriteData (or AddFile): Not granted AppendData (or AddSubdirectory or CreatePipeInstance): Not granted WriteEA: Not granted ReadAttributes: Granted by ACE on parent folder D:(A;;0x1301bf;;;BA) WriteAttributes: Not granted Access Mask: 0x120196 Privileges Used for Access Check: - Restricted SID Count: 0 Event Xml: 4656 1 0 12800 0 0x8010000000000000 1535565 Security 0BraApps1.brenntagLA.hou S-1-5-21-205301047-3902605089-2438454170-21511219 jaadmin BRENNTAGLA 0xbbe3f Security File C:\Windows\System32\ServerManager.msc 0x0 {00000000-0000-0000-0000-000000000000} %%1538 %%1541 %%4417 %%4418 %%4420 %%4423 %%4424 %%1538: %%1801 D:(A;;0x1200a9;;;BA) %%1541: %%1801 D:(A;;0x1200a9;;;BA) %%4417: %%1805 %%4418: %%1805 %%4420: %%1805 %%4423: %%1811 D:(A;;0x1301bf;;;BA) %%4424: %%1805 0x120196 - 0 0x60c C:\Windows\System32\mmc.exe Any ideas?

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Blocking a country (mass iP Ranges), best practice for the actual block

- by kwiksand

Hi all, This question has obviously been asked many times in many different forms, but I can't find an actual answer to the specific plan I've got. We run a popular European Commercial deals site, and are getting a large amount of incoming registrations/traffic from countries who cannot even take part in the deals we offer (and many of the retailers aren't even known outside Western Europe). I've identified the problem area to block a lot of this traffic, but (as expected) there are thousands of ip ranges required. My question now (finally!). On a test server, I created a script to block each range within iptables, but the amount of time it took to add the rules was large, and then iptables was unresponsive after this (especially when attempting a iptables -L). What is the most efficient way of blocking large numbers of ip ranges: iptables? Or a plugin where I can preload them efficiantly? hosts.deny? .htaccess (nasty as I'd be running it in apache on every load balanced web server)? Cheers

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Can access website but images, css stylesheets and javascript files do not download

- by Triztian

i have this problem, not sure about the source of it, Basically the title describes the issue, I can access the webpage and see the html structure, but no resources are being donwloaded nor I have access to them using the browser that means, no javascript, no css styles and no images., any solutions?, Im using tomcat by the way. EDIT 1 If I access the tomcat manager from within the server it also blocks the images. I'm running on windows server 2008 R2.

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iptables secure squid proxy

- by Lytithwyn

I have a setup where my incoming internet connection feeds into a squid proxy/caching server, and from there into my local wireless router. On the wan side of the proxy server, I have eth0 with address 208.78.∗∗∗.∗∗∗ On the lan side of the proxy server, I have eth1 with address 192.168.2.1 Traffic from my lan gets forwarded through the proxy transparently to the internet via the following rules. Note that traffic from the squid server itself is also routed through the proxy/cache, and this is on purpose: # iptables forwarding iptables -A FORWARD -i eth1 -o eth0 -s 192.168.2.0/24 -m state --state NEW -j ACCEPT iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A POSTROUTING -t nat -j MASQUERADE # iptables for squid transparent proxy iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j DNAT --to 192.168.2.1:3128 iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128 How can I set up iptables to block any connections made to my server from the outside, while not blocking anything initiated from the inside? I have tried doing: iptables -A INPUT -i eth0 -s 192.168.2.0/24 -j ACCEPT iptables -A INPUT -i eth0 -j REJECT But this blocks everything. I have also tried reversing the order of those commands in case I got that part wrong, but that didn't help. I guess I don't fully understand everything about iptables. Any ideas?

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