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  • How to discover web servers on a local network?

    - by Stefan Kendall
    Suppose I'm running several servers serving basic requests on my local network (say a home network, where all machines generally have an IP in the form K.K.K.x, where x is variable). Is there an easy way to discover all such servers? I would need to find each IP on the network running a particular java server application.

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  • Can only connect to sql server express 2012 via named pipes

    - by YetAnotherDeveloper
    I have sql server express 2012 installed on windows 2008, locally everything works just fine i can connect via tcpip and named pipes. Remotely i can connect with ssms only using named pipes. I have tried disabling the firewall on both sides to eliminate blocking traffic. i have toggled the tcpip setting on and off (i read somewhere that they got it working just but flipping them off and back on). I have double/triple checked all the settings that i'm aware of and everything seems to be correct. Tcp is enabled Tcp port is set to 1433, udp port is set to 1434 Server has static ip Start up log says: Server is listening on [ 'any' 1433]. Firewall rules are in place Any suggestions on things that i can look into? i have really just run out of ideas.

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  • Virtual bridge/switch for Windows server&client?

    - by Tiberiu-Ionu? Stan
    I can't find a very simple application, with litle to zero configuration on both client and server side which would help one computer to bring other computers on an existing private LAN. OpenVPN seems like an overkill for this type of thing, and is really hard to get running or debug by various clueless people trying to connect. Does such a software exist? It's very odd not to. THe Windows provided VPN (PPTP over TCP and GRE) is not what I'm looking for because it is often filtered by ISPs. Only TCP and UDP solutions pls. Encryption is not needed.

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  • JBoss naming service port conflict

    - by Kramer
    I am having trouble getting JBoss started. I am running JBoss 5.1.0 on Mac OSX (yes, I know it is an old version, but that’s what the application is certified on for now). I am using Apple’s JVM 1.6.0_37. I get the following error when trying to use JBoss (there are some more exceptions, but these are the first few): Error installing to Start: name=jboss:service=Naming state=Create mode=Manual requiredState=Installed java.rmi.server.ExportException: Port already in use: 1098; nested exception is: java.net.BindException: Can't assign requested address at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:310) at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:218) Caused by: java.net.BindException: Can't assign requested address at java.net.PlainSocketImpl.socketBind(Native Method) at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:383) 16:57:15,596 ERROR [AbstractKernelController] Error installing to Real: name=vfsfile:/Users/home/server/jboss-5.1.0.GA/server/myserver/conf/jboss-service.xml state=PreReal mode=Manual requiredState=Real org.jboss.deployers.spi.DeploymentException: Error deploying: jboss:service=Naming at org.jboss.deployers.spi.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:49) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:118) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:46) Caused by: java.rmi.server.ExportException: Port already in use: 1098; nested exception is: java.net.BindException: Can't assign requested address at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:310) Caused by: java.net.BindException: Can't assign requested address at java.net.PlainSocketImpl.socketBind(Native Method) Now I know what you are thinking, that I am running something that conflicts with that port, but I have used lsof and there is nothing listed on that port. I have tried changing the port in conf/bindingservice.beans/META-INF/bindings-jboss-beans.xml: <bean class="org.jboss.services.binding.ServiceBindingMetadata"> <property name="serviceName">jboss:service=Naming</property> <property name="bindingName">RmiPort</property> <property name="port">5098</property> <property name="description">Socket Naming service uses to receive RMI requests from client proxies</property> </bean> Unfortunately, I then get the name errors with the new port number. I also installed a network monitoring tool on my box and it doesn't look like any ports are being opened when I start jboss, but it is possible, that the tool might be missing a port that is opened and then closed quickly. Any ideas what could be the problem or how to fix it?

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  • Spawning HTTPD processes

    - by felix001
    Can any confirm how Apache spawns new children ? As in if I connect to a webserver (HTTP 1.0 / no keep alive) and issue a HTTP /GET I will be spawned a new HTTPD child. If then issue another HTTP /GET then a new TCP connection will be built. However will I use the same child process of would I spawn a new one ? Also if I was using HTTP 1.1 (with keep-alive) and reused the same TCP connection, would the httpd process/spawning be any different to that if I wasnt using keepalive ? Thanks,

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  • Duplicate Name Exists error from virtual PC with NAT network configuration

    - by Phred
    Whenever I change the network configuration to NAT for a virtual machine running under Virtual PC 2007, I get "A duplicate name exists on the network." error. There is no other machine on my network with this name and running the VM in any other network configuration doesn't cause this error. This seems to be a common problem with Virtual PC 2007 based on a google search but no-one seems to have a solution to it. So far, I've discovered that turning off NETBIOS over TCP causes the problem to go away but I need to join this VM to a domain and you can't do that if NETBIOS over TCP is turned off.

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  • IOS not saving evaluate rule in access-list

    - by DeeJay1
    Hi. I have a basic firewall set up on an pretty od IOS in form of IPv6 access list exterior-in6 evaluate exterior-reflect sequence 1 permit ipv6 any host [my external address] sequence 10 permit tcp any host [my internal address] eq 22 sequence 11 permit icmp any any sequence 800 permit udp any any range 6881 6889 sequence 900 permit tcp any any range 6881 6889 sequence 901 deny ipv6 any any sequence 1000 IPv6 access list exterior-out6 permit ipv6 [my internal subnet] any reflect exterior-reflect sequence 10 Unfortunately the evaluate exterior-reflect sequence 1 line seems to get lost after each reboot, leaving my internal network without access. Any ideas?

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  • Setting up a transparent proxy with only one box.

    - by Scott Chamberlain
    I am playing around with transparent proxies, unfortunately I do not have two machines to test it out with. The current way I am doing things is the program makes a request to a computer on port 80, I use iptables -t nat -A OUTPUT -p tcp --destination-port 80 -j REDIRECT --to-port 1234 to redirect to my proxy that I am playing with. the proxy will send out a request to port 81 (as all outbound port 80 are being fed back in to the proxy so I want to do something like iptables -t nat -A OUTPUT -p tcp --destination-port 81 -j DNAT --to-destination xxxx:80 The problem lies with the xxxx part. How do I change the destination port without changing changing the destination ip? Or am I doing this setup completely wrong, I am learning after all and constructive criticism is definitely appreciated. The machine I am using is pretty low end so I would like not not have to create a VM with a second box unless absolutely necessary.

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  • Howto obtain Per-Interface statistics on windows

    - by Canacourse
    I am trying to find the most used Network card on windows 200 or XP. I planned to obtain the number of packets sent trough each NIC to determine the main NIC. I thought IP Helper might give me this information but also it looks like the functions in IP helper only give stats for all interfaces. I know this can be done. Any ideas? Many Thanks...

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  • Can't get port forwarding to work on Ubuntu

    - by Znarkus
    I'm using my home server as NAT/router, which works well. But now I'm trying to forward port 3478, which I can't get to work. eth0 = public interface eth1 = private network $ cat /proc/sys/net/ipv4/conf/eth0/forwarding 1 $ cat /proc/sys/net/ipv4/conf/eth1/forwarding 1 Then to forward port 3478 to 10.0.0.7, I read somewhere that I should run iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 3478 -j DNAT --to-destination 10.0.0.7:3478 iptables -A FORWARD -p tcp -d 10.0.0.7 --dport 3478 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT I also ran ufw allow 3478 But testing port 3478 with http://www.canyouseeme.org/ doesn't work. Any idea what I have done wrong?

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  • Iptables rules make communication so slow

    - by mmc18
    When I have send a request to an application running on a machine which following firewall rules are applied, it waits so long. When I have deactivated the iptables rule, it responses immediately. What makes communication so slow? -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -p esp -j ACCEPT -A INPUT -i ppp+ -j ACCEPT -A INPUT -p udp -m udp --dport 500 -j ACCEPT -A INPUT -p udp -m udp --dport 4500 -j ACCEPT -A INPUT -p udp -m udp --dport 1701 -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -i lo -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 -A FORWARD -i ppp+ -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT

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  • Host data transfer limit calculations and network protocol headers

    - by UpTheCreek
    OK, this might be a really stupid question, but... I'm building a web app that utilises websockets. There's fairly rapid messaging going on, so I've been taking a look at the network traffic with wireshark, to see if there's any way of reducing the amount of data we are sending over the wire, and hence costs. A typical message has approx 150 byte data payload, and according to wireshark the lower layer stuff takes up about: Ethernet: 14 bytes IP: 20 Bytes TCP: 20 Bytes My question is, are these network headers included in data transfer calculations? What about TCP ACK messages? (another 54 bytes according to wireshark) This may seem petty, but because we have so much messaging going on, and because the payload is a similar size to these headers, it's significant.

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  • How to break from loop by the cancel button in inputbox

    - by yael
    The following VB script check the valid IP by Test function if we get OK from the test function then We break from loop ValidIP=OK If not the inputBox ask the question until ValidIP=OK But sometimes I want to exit from loop by cancel button How to break loop by the cancel button (in order to set the ValidIP as OK) Do Until ValidIP=OK IPrange=InputBox("Enter IP address range",,"172.17.202.1-10,192.9.200.1-100") Test IPrange, strPattern Loop

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  • converting a csv into text

    - by user349418
    I have a csv (large) file of ip addresses, and wish to covert into single line ip address in bash. aa.bb.cc.dd,aa.bb.cc.dd,aa.bb.cc.dd,.. into aa.bb.cc.dd aa.bb.cc.dd aa.bb.cc.dd [..] The list of ips in question, http://www.stopforumspam.com/downloads/bannedips.zip

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  • How host name is broadcasted in a subnet

    - by apalopohapa
    Hello. I'm working with Microchip's TCP/IP stack and the host name of my device is not being broadcasted, although I can access it using its DHCP assigned IP. So the question is, what is the protocol that a network device uses to broadcast its host name, so that when I see a list of devices in a network I can identify it by name? Is it the NetBIOS name service or something else? Thanks in advance.

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  • What's the easiest way to parse a string in C?

    - by Luca Matteis
    I have to parse this string in C: XFR 3 NS 207.46.106.118:1863 0 207.46.104.20:1863\r\n And be able to get the 207.46.106.118 part and 1863 part (the first ip address). I know I could go char by char and eventually find my way through it, but what's the easiest way to get this information, given that the IP address in the string could change to a different format (with less digits)?

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  • iptables to allow input and output traffic to and from web server only

    - by Caedmon
    I have an Elastic Search server which seems to have been exploited (it's being used for a DDoS attack having had NO firewall for about a month). As a temporary measure while I create a new one I was hoping to block all traffic to and from the server which wasn't coming from or going to our web server. Will these iptables rules achieve this: iptables -I INPUT \! --src 1.2.3.4 -m tcp -p tcp --dport 9200 -j DROP iptables -P FORWARD \! --src 1.2.3.4 DROP iptables -P OUTPUT \! --src 1.2.3.4 DROP The first rule is tried and tested but obviously wasn't preventing traffic coming from my server to other IP addresses so I was hoping I could add the second two rules to full secure it.

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  • Use SSH reverse tunnel to bypass VPN [on hold]

    - by John J. Camilleri
    I have shell access to a server M, but I need to log into a VPN on my machine L in order to access it. I want to be able to get around this VPN, and I've heard I can do this by creating a reverse SSH tunnel and using a intermediate server E (which I can access without the VPN). This is what I am trying: Turn on VPN on L, open SSH session to M On M, execute the command: ssh -f -N -T -R 22222:localhost:22 user@E From L, try to open SSH session to E on port 22222, hoping to end up at M Step 2 seems to work without any complaint, but on step 3 I keep getting "connection refused". I have made sure that port 22222 is open on E: 7 ACCEPT tcp -- anywhere anywhere tcp dpt:22222 I'm pretty new to SSH tunnelling and not sure what the problem could be. Any ideas what I can try?

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  • Mysql - GROUP BY Avoid using tempoary

    - by jwzk
    The goal of this query is to get a total of unique records (by IP) per ref ID. SELECT COUNT(DISTINCT ip), GROUP_CONCAT(ref.id) FROM `sess` sess JOIN `ref` USING(row_id) WHERE sess.time BETWEEN '2010-04-21 00:00:00' AND '2010-04-21 23:59:59' GROUP BY ref.id ORDER BY sess.time DESC The query works fine, but its using a temporary table. Any ideas?

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  • Create variables for unknown amount of arguments?

    - by user347600
    Working on an rsync script and the portion below is in a for loop. What I want to achieve is assign a variable to every arguement after 3. Just confused if I need to create another loop for that or not: #1: name name=$1 #2: ip ip=$2 #3: user user=$3 #4+: folder exlusion #any lines higher than 3 will be created as exlcude folders ex[ARG_NUMBER]=

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  • Don't understand [0:0] iptable syntax

    - by artaxerxe
    I'm struggling with some iptables rules. I'm a newbie in iptables. I found some resources where I get the following command related to iptables. This is stored in a file that will be executed. [0:0] -A PREROUTING -s 10.1.0.0/24 -p tcp -m tcp --dport 81 -j DNAT --to-destination 10.1.0.6:3128 Can anybody explain me what does [0:0] mean? Also, some link related to this in iptables are welcome. Thanks in advance! P.S. If you need more rules, just let me know.

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  • Nginx works on my linux machine but is not accessible from other computers in my local network

    - by crooveck
    In my LAN network I have a server with Scientific Linux (RedHat or Fedora based distro), I've done yum install nginx but the welcome page is not accessible from other computers in my network. When I do telnet open localhost 80 and then GET / HTTP/1.0 I get some html code from nginx, so it's running for sure. But when I want to connect remotly, doing telnet open 192.168.3.130 80 I get: Trying 192.168.3.130... telnet: Unable to connect to remote host: No route to host So I assume that there is something wrong with my network settings, maybe iptables or something else? Next step, I turned off iptables: service iptables stop and it helped, now I can connect remotely using telnet. So I think, I need to fix my iptables rules. I did some googling and found this rule -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT but it still didn't allow me to connect remotely when iptables is up. Can someone please help me setting a proper iptables configuration?

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  • Problem with SQL query

    - by William
    Here's the query INSERT INTO test_bans( ip, Expiration ) VALUES ( "0.0.0.0", DateAdd( "d", 1, Date( ) ) ) Here's the table creation query CREATE TABLE test_bans ( ID smallint(6) NOT NULL AUTO_INCREMENT, IP text NOT NULL, Expiration DATETIME NOT NULL, PRIMARY KEY (ID) ) TYPE=MyISAM; And here's the error #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')))' at line 1 Please help.

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