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• Forwarding broadcast traffic

  - by Dragos

  I have a host that receives broadcast queries on a UDP port. I would like to forward this broadcast traffic to another host from another network. Is it possible to port forwarding broadcast traffic using iptables? I have tried to specify package traffic as broadcast, but I didn't success. (-m pkttype --pkt-type broadcast). If I recive unicast traffic on that port, the forwarding succeeds. I try to forwarding using nat table.(-A POSTROUTING -j DNAT --to-destinatiox x.x.x.x) Thanks.

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• AWS:EC2:: Could not connect FTP client?

  - by heathub

  My Server OS: Amazon Linux I am trying to set up ftp. I have: Installed vsftpd open port 20-21 open port 1024 - 1048 Basically, I followed every of these steps Start vsftpd service (the status indicate [ok]) I use filezilla for my ftp client. Here is my setting/configuration: Host: ec2-XX-XX-XXX-XX.compute-1.amazonaws.com Port: -(blank, but I have tried 20 and 21 though) Server Type: FTP - File Transder Protocol Logon Type: Normal Username: (tried root and ec2-user) Transfer mode: Tried passive and active I always has this error: Status: Waiting to retry... Status: Resolving address of ec2-XX-XX-XXX-XX.compute-1.amazonaws.com Status: Connecting to XX.XX.XXX.XX:21... Error: Connection timed out Error: Could not connect to server Have I missed any configuration/settings? EDIT After execute the /sbin/iptables -L -n Here is the result: Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination

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• No blocked ports on internal interface of ASA

  - by blsub6

  I have a cisco ASA 5505 with three interfaces: Internal (100), DMZ (50) and External (0). The internal has a IPSEC VPN tunnel to my internal network I couldn't log in to my domain because of all of the port restrictions and such. I tried monitoring the traffic through the interface, seeing what it's blocking and then unblocking those ports but even then it didn't work completely correctly I finally just added a rule to permit any ip traffic from any network to any network on the internal interface and, of course, it worked fine But is that good security practice? Should I be blocking ports on an interface that's internal and over a VPN with the highest security level?

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• Iptables REDIRECT + openvpn problem

  - by Emilio

  I want to redirect connection to port 22 to my openvpn binded port, on 60001. Openvpn is running on server on 60001 server:~$ sudo netstat -apn | grep openvpn udp 0 0 67.xx.xx.137:60001 0.0.0.0:* 4301/openvpn I redirect on server port 22 to 60001 server:~$ sudo iptables -F -t nat server:~$ sudo iptables -A PREROUTING -t nat -p udp --dport 22 -j REDIRECT --to-ports 60001 I start openvpn client (openvpn.conf is correct, it works with remote IP 22 replaced with remote IP 60001) client:~$ ./openvpn openvpn.conf Tue Apr 27 00:42:50 2010 OpenVPN 2.1.1 i686-pc-linux-gnu [SSL] [EPOLL] built on Mar 23 2010 Tue Apr 27 00:42:50 2010 UDPv4 link local (bound): [undef]:1194 Tue Apr 27 00:42:50 2010 UDPv4 link remote: 67.xx.xx.137:22 Tue Apr 27 00:42:52 2010 read UDPv4 [ECONNREFUSED]: Connection refused (code=111) Tue Apr 27 00:42:55 2010 read UDPv4 [ECONNREFUSED]: Connection refused (code=111) ... It doesn't connect. iptables shows requests from client to server but no answers. What's wrong with it?

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• Does Apache 2.2 (windows) have any default bandwidth limit?

  - by igino manfre'

  I'm running Apache on a server in cloud (Windows server 2008 R2 on VMware, 1 Gbps of BW, http://95.110.164.61 ). I'm streaming many live DVB MPEG Transport Stream, precompressed in loop, (not flash) generated by VLC on port 640xx and then reverse proxied by Apache on port 80. The server's firewall is open for VLC and Apache on all ports. Above 1.5 Mbps the reproduction is affected by continous stop & go. Please note that if you request a stream generated by VLC directly at http://95.110.164.61:64087/mpg2_6.4 you see a correct stream, while if you request http://95.110.164.61/mpg2_6.4 you do not. I know that Flash streaming Server uses Apache to stream on port 80 (and it works). I'm not an expert with Apache, can anyone tell me if any "special" module is required to increase the bandwidth?

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• ssmtp for windows

  - by reox

  I have the following problem with a software that should do mail notification for a biometric entry system: the software does currently only support SMTP over port 25 without TLS/SSL. Which is bad because port 25 is blocked in our network due spam reason and our mailserver only support TLS / SSL logins. so i need a solution to connect to a localhost smtp server which just relays to my ssl host on port 587. i know there is ssmtp for linux, but i need it for windows, because the server app for this biometric stuff only runs on windows... edit: i know there is the IIS SMTP Server, but maybe something different?

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• Logs being flooded from Squid for having intercepted and authentication enabled together

  - by Horace

  I have done some hefty Google'ing and I can't seem to find a single solution to this issue that I cam currently experiencing. Here is a sample configuration from squid that I have: # # DIGEST Auth # auth_param digest program /usr/sbin/digest_file_auth /etc/squid/digpass auth_param digest children 8 auth_param digest realm LHPROJECTS.LAN Network Proxy auth_param digest nonce_garbage_interval 10 minutes auth_param digest nonce_max_duration 45 minutes auth_param digest nonce_max_count 100 auth_param digest nonce_strictness on # Squid normally listens to port 3128 # Squid normally listens to port 3128 http_port 192.168.10.2:3128 transparent https_port 192.168.10.2:3128 intercept http_port 192.168.10.2:3130 As noted above, I have three ports defined, 2 of them are transparent/intercept and one is a regular http port (which I use for authentication). Which works rather well in this configuration however my logs are getting flooded of this entry authentication not applicable on intercepted requests whenever a transparent connection is made. So far, I can't seem to find any documentation that would describe how to suppress these messages ?

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• SSH without portforward

  - by maigel

  I have a raspberry pi lying around in my dorm room. It's connected to campus internet which has all ports closed and I obviously don't have any access or permission to port forwarding. Now I want to ssh to the raspberry pi but this isn't possible since I can't port forward. I do however have a cheap vps doing nothing. Is there a way to make the pi connect to the vps and then use the vps as some sort of tunnel to ssh to the raspberry pi without having any port forwarding done?

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• how to set up domain name, bad request invalid hostname

  - by user45645

  assume i have a domain name which will be forwarded to my public ip (web server) automatically. in IIS 6, ip is public ip port is 6666, advanced - host value is www.hello.com firewall is open for 6666(web server port) and 53(DNS port), DMZ of router is my physical address in DNS, i have already had a zone called oldhello.com. And i expect a new domain name. So i have addded a new zone called hello.com and checked SOA server (P) is one.hello.local. then added a new host called one, full name is one.hello.com, ip address 192.168.7.3(my address in router) and then add a alias(CNAME) www, full name is www.hello.com, FQDN i choose the host i added before (one.hello.com) i expected that when i type the public ip in browser, can it be changed to domain name automatically. if not set host value www.hello.com, use public ip i can see the web however, after set up host value www.hello.com, browser show bad request invalid hostname

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• Web server suddenly stopped working

  - by wezten

  I have a web server, which was working fine. It also was an FTP server and a Windows Remote Desktop server, all working fine. Someone called our ISP to increase the internet speed, and suddenly nothing works - I can connect with Teamviewer, but HTTP, FTP & RD doesn't work. Disabled firewall. Ran Wireshark - the packets don't come through at all. Set the webserver to port 20111, in case the ISP is blocking port 80, and again, the packets didn't come through at all. (localhost:20111 works fine) Port forwarding is set up for ports 80, 21, 3389 & 20111 to 10.0.0.32 (which is the correct address - checked with ipconfig). Restarted router and computer. I would be very grateful for any help.

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• Find hosted directories/ports in Jetty/Apache

  - by Paul Creasey

  Hi, I first asked this on SO, but i didn't get a response and i think it is probably more appropriate here. Let say I have a directory which is being hosted by Jetty or Apache (i'd like an answer for both), i know the URL including the port and i can log into the server. How can i find the directory that is being hosted by a certain port? I'd also like to go the other way, i have a folder on the server, which i know if being hosted, but i don't know the port so i can't find it in a web browser. How can i find a list of directories that are being hosted? This has been bugging me for ages but i've never bothered to ask before! Thanks.

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• Deactivate SYN flooding mechanism

  - by mlaug

  I am running a server that is running a service on port 59380. There are more than 1000 machines out there connecting to that service. Once I need to restart the service all those machines are connecting at the same time. That made some trouble as I have seen that log entry in kern.log TCP: Possible SYN flooding on port 59380. *Sending cookies*. Check SNMP counters. So I changed sysctl net.ipv4.tcp_syncookies to 0 because the endpoints to not handle tcp syn cookies correctly. Finally I restarted my network to get the changes in production Next time I had to restart the service, the following message was logged TCP: Possible SYN flooding on port 59380. *Dropping request*. Check SNMP counters. How can I prevent the system for doing such actions? All necessary counter measures are done by iptables...

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• switch OFF syn cookies

  - by Nick

  We have several servers they have public IP's, but work together (one is with Load Balancer, orther with Apache Web server, other with MySQL and so on. Most of the ports are fire-walled, so only "local" servers can be connect there. However ALL servers have some ports that must be publicly open. We have SYN Cookies enabled and from time to time we got: possible SYN flooding on port 8080. Sending cookies. Port 8080 is not public. How we can switch OFF SYN Cookies for some ports (e.g. 8080, 3306 etc) or from some sources (e.g. our servers), but in same time SYN Cookies to be switched ON for all other ports, e.g. port 80. We found this similar problem, except our servers are with public IP's: SYN cookies on internal machines

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• How do I configure ubuntu server's iptables to allow java without opening the floodgates?

  - by rofls

  I'm new to servers, so please bear with me. I have my amateur site running. Problem is, I followed Rackspace's instructions on setting up iptables and am pretty sure that's why the java server I'm trying to use on port 8080 isn't working (it runs the script but my android test app doesn't connect to it). When I try running the same java server script on port 80 it doesn't even start. I also ran nmap on my domain and saw that indeed only port 80 and 22 (for ssh) are responding. Is it possible to run Java and apache happily on the same server? If so, how can I configure my iptables correctly. (I'm aware that I should probably do some sort of filtering in the java server itself, but will figure that out later).

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• Why is file sharing over internet still working, despite all firewall exceptions for filesharing being disabled?

  - by Triynko

  Every exception in my windows server firewall that starts with "File and Printer Sharing" is disabled (ordered by name, so that includes domain, public (active), and private profiles). The Network and Sharing Center's options for everything except password protected sharing are off. Why would I still be able to access a network share on that server via an address like "\\my.server.com\" over the internet? The firewall is on for all profiles and blocking incoming connections by default. A "netstat -an" command on the server reveals the share connection is occurring over port 445 (SMB). I restarted the client to ensure it was actually re-establishing a new connection successfully. Is the "Password protected sharing: On" option in Network and Sharing Center bypassing the firewall restrictions, or adding some other exception somewhere that I'm missing? EDIT: "Custom" rules are not the problem. It's the "built-in" rules for Terminal Services that was the problem. Can you believe port 445 (File Sharing Port) has to be wide open to the internet to use Terminal Services Licensing?)

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• Setting up a copy of a site with IIS 7?

  - by SJaguar13

  I have a site running on IIS with a dyndns.org domain that points to the IP of the Windows 2008 machine hosting it. I need a copy of that site for development purposes. I set up another folder with all the files, and create a new site in IIS. I don't really have a domain for it, so I was just going to use the IP address. When I go to localhost, 127.0.0.1, or the internal IP, I get bad hostname. If I use the IP address on port 80 (the same as the real version of the site), I get 404 not found. If I use a different port so I don't have them both on the same IP with the same port, I get connection timed out. How do I go about setting this up?

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• howt setup remote access into computer behind 2 routers?

  - by Steve Wasiura

  I can setup remote access to a pc behind a single router/firewall by using NAT and Port Forwarding, simples! But there is a customer that shares an internet connection with another office, and they are behind a second router firewall. I drawed a picture with my crayons but I can't attach it because I'm a new account on SF. see it here: http://i.imgur.com/b3FDx.png So how would I setup remote access to the pc that is beind the second firewall? It must be something about static routes, i.e. if I hit the wan ip on port 4905 I want it to forward it to 10.0.0.30 by going through 192.168.1.10 so a route statement like for all requests to 10.0.0.30, use 192.168.1.10 ? and ass u me router 2 has a static gateway ip of 192.168.1.10 and need a standard NAT on router 2 to point port 4905 to 10.0.0.30 is this the right way, any tips? both routers are netgear consumer equipment. thanks

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• Can't access to access to my web server inside a network with Firewall on

  - by ianenri

  I set up a Web server with the following: There is the Internet Router, configured to Port Foward port 80 to my computer assigned to my PC's IP: 192.168.1.128 My PC is connected to that wireless router from wlan0 Then, my PC is also connected to my device (which is the webserver) with a crossover-cable usign eth0 having this anohter IP: 10.42.43.1 Finally, my device (the webserver) is connected with eth0 with this IP: 10.42.43.55 As you can see, I need to install a reverse-proxy to be able to resolve to my device's webserver. I installed pound (proxy server) in my PC and configured properly to make 192.168.1.128 resolve to 10.42.43.55 So, I just typing my ISP provided IP 200.x.x.x resolves to my device webserver. But there's a problem: I HAD TO STOP MY FIREWALL. I don't know how I need exactly configure the firewall in SUSE YAST2, or at least iptables. Stopping it is not an option, not for security reasons, just because there's port fowarding rule that is needed to give Internet access to my device too. I'm using openSUSE 12.1

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• VM VirtualBox, Ubuntu 9.10: USB memory stick and SD card not detected...

  - by vikramtheone

  Hello Guys, I have installed Ubuntu9.10 on VM VirtualBox, on my HP laptop. My laptop has several USB ports and also a SD card port. Unfortunately, I'm unable to access both, my pen-drive on the USB port and my 8GB SD card inserted in the SD Card port. Can anyone suggest me what I should do for my Ubuntu to detect both of them? I have installed all latest updates on Ubuntu. I'm able to use my USB mouse. Thank you Vikram

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• "bin/sh: can't access tty; job control turned off” error when running shellcode"

  - by Nosrettap

  I'm writing shellcode to exploit a buffer overflow vulnerability on a server. To do so I have port binding shellcode that I send to the server and then I run (from a linux terminal) the command telnet serverAdress 4444 where 4444 is the port which I have opened up. The hope is that I will receive a shell back that I can use to execute commands. However, I always end up with the command bin/sh: can't access tty; job control turned off I can't change any of the server code, and I believe the shellcode is correct because I got it from this website (http://www.tsirogiannis.com/exploits-vulnerabilities-videos-papers-shellcode/linuxx86-port-binding-shellcode-xor-encoded-152-bytes/). From my research, it appears that this may have to do with the mode that my terminal is running in (something called interactive mode...or something like that). All computers involved are linux machines and the machine that I am on is running the latest version of Ubuntu. Any ideas what this job control error means and how I can fix it?

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• Grails SSL TOMCAT

  - by user974459

  I'm implementing grails with SSL and deployed to tomcat 7.0. I have used spring security plugin for SSL. In tomcat, I added <Connector port="80" protocol="HTTP/1.1" connectionTimeout="200000000" redirectPort="443" /> <Connector port="8443" protocol="HTTP/1.1" connectionTimeout="200000000" redirectPort="443" /> <Connector port="443" maxThreads="200" scheme="https" secure="true" SSLEnabled="true" keystoreFile="${user.home}/.keystore" keystorePass="123456" clientAuth="false" sslProtocol="TLS"/> if I type https://localhost is ok. But my app doesn't work.

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• Spambot Infection Detection

  - by crankshaft

  My server has been blocked by CBL for participating in curtwail spambot. Initially we suspected that it was coming from a PC and not from the server, but the router is blocking all packets on 25 except those coming from the server. I have just executed the tcpdump command and every 5 minutes I see a flurry of activity on port 25 that is very suspicious and I am sure that there is some process running on the server: 13:02:30.027436 IP exprod5og110.obsmtp.com.53803 > ubuntu.local.smtp: Flags [S], seq 171708781, win 5744, options [mss 1436,sackOK,TS val 3046699707 ecr 0,nop,wscale 2], length 0 I have stopped postfix, and yet there is still traffic on port 25 above. But how can I find what process is actually communicating on port 25 as it only rund for a few seconds and so for example lsof -i :25 will never catch it. I have been working on this now for 2 days, it is a live server and I cannot simply shut it down, any suggestion on how I can detect the source of this email bot process ?

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• Hide the ports in the url of a tomcat application

  - by S.M.09

  I have setup tomcat 6 on a server with several different instances which run on different ports For Eg: http://10.XXX.XXX.XXX:8080/myAPP1 http://10.XXX.XXX.XXX:8088/myAPP2 http://10.XXX.XXX.XXX:8082/myAPP3 and so on... These urls are available two the users using these and other applications Now I want to hide the ports on which each of the applications are running... So that the user could see only something like this http://10.XXX.XXX.XXX/myAPP1 http://10.XXX.XXX.XXX/myAPP2 http://10.XXX.XXX.XXX/myAPP3 What is needed to be done for this I have achieved this for one url (i.e. one port) using the firewall rules and redirect the request on HTTP 80 port to the port that tomcat is listening.. But I want such patter to appear for all the urls... How can I go about this? Specs HOST M/C : 64 bit OS: Linux Redhat Tomcat : 6.0

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• DVI monitor detected only on computer startup

  - by kamil

  I've recently connected a new monitor, LG M2252D-PZ, to a rather outdated computer with Windows XP and Radeon 9600. XP has SP3 installed, video drivers are the latest version back from the times the video card was still supported. My problem is that the monitor works fine only as long as I don't turn it off or switch it to a different input. When I turn it back on, it says "no signal". The key to the problem must be the DVI port, to which the new monitor is connected. The previous monitor was connected to the VGA output, and I've tested that the new one also works fine when connected to the analogue port. Apparently, the computer tests for the presence of a monitor on the DVI port only on startup. The question is, how do I change this?

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• How to use OpenVPN through a restrictive firewall?

  - by R.L. Stine

  I'm currently in the situation of attempting to setup OpenVPN on a personal VPS, for connection primarily through an overly restrictive firewall. All of the setups mentioned below work when used through a reasonably-firewalled connection. I have tried: OpenVPN running on the standard port OpenVPN running on port 443 (I start OpenVPN manually from the command line on the VPS and see that the server reports the connection being closed almost immediately, I assume this is a result of DPI on the firewall) STunnel running on port 443 to access OpenVPN and evade DPI. This is the most successful and allows a connection and internet access through the VPN for ~10-20 seconds, before the connection is forcibly closed. Is there anything else I can attempt?

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