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  • Does Java 6 open a default port for JMX remote connections?

    - by Bob Cross
    My specific question has to do with JMX as used in JDK 1.6: if I am running a Java process using JRE 1.6 with com.sun.management.jmxremote in the command line, does Java pick a default port for remote JMX connections? Backstory: I am currently trying to develop a procedure to give to a customer that will enable them to connect to one of our processes via JMX from a remote machine. The goal is to facillitate their remote debugging of a situation occurring on a real-time display console. Because of their service level agreement, they are strongly motivated to capture as much data as possible and, if the situation looks too complicated to fix quickly, to restart the display console and allow it to reconnect to the server-side. I am aware the I could run jconsole on JDK 1.6 processes and jvisualvm on post-JDK 1.6.7 processes given physical access to the console. However, because of the operational requirements and people problems involved, we are strongly motivated to grab the data that we need remotely and get them up and running again. EDIT: I am aware of the command line port property com.sun.management.jmxremote.port=portNum The question that I am trying to answer is, if you do not set that property at the command line, does Java pick another port for remote monitoring? If so, how could you determine what it might be?

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  • Creating a HTTP handler for IIS that transparently forwards request to different port?

    - by Lasse V. Karlsen
    I have a public web server with the following software installed: IIS7 on port 80 Subversion over apache on port 81 TeamCity over apache on port 82 Unfortunately, both Subversion and TeamCity comes with their own web server installations, and they work flawlessly, so I don't really want to try to move them all to run under IIS, if that is even possible. However, I was looking at IIS and I noticed the HTTP redirect part, and I was wondering... Would it be possible for me to create a HTTP handler, and install it on a sub-domain under IIS7, so that all requests to, say, http://svn.vkarlsen.no/anything/here is passed to my HTTP handler, which then subsequently creates a request to http://localhost:81/anything/here, retrieves the data, and passes it on to the original requestee? In other words, I would like IIS to handle transparent forwards to port 81 and 82, without using the redirection features. For instance, Subversion doesn't like HTTP redirect and just says that the repository has been moved, and I need to relocate my working copy. That's not what I want. If anyone thinks this can be done, does anyone have any links to topics I need to read up on? I think I can manage the actual request parts, even with authentication, but I have no idea how to create a HTTP handler. Also bear in mind that I need to handle sub-paths and documents beneath the top-level domain, so http://svn.vkarlsen.no/whatever/here needs to be handled by a single handler, I cannot create copies of the handler for all sub-directories since paths are created from time to time.

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  • What happens when we say "listen to a port" ?

    - by smwikipedia
    Hi, When we start a server application, we always need to speicify the port number it listens to. But how is this "listening mechanism" implemented under the hood? My current imagination is like this: The operating system associate the port number with some buffer. The server application's responsibiligy is to monitor this buffer. If there's no data in this buffer, the server application's listen operation will just block the application. When some data arrives from the wire, the operating system will know that check the data and see if it is targed at this port number. And then it will fill the buffer. And then OS will notify the blocked server application and the server application will get the data and continue to run. Question is: If the above scenario is correct, how could the opearting system know there's data arriving from wire? It cannot be a busy pooling. Is it some kind of interrupt-based mechanism? If there's too much data arriving and the buffer is not big enough, will there be data loss? Is the "listen to a port" operation really a blocking operation? Many thanks.

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  • Unix ? Linux ????????? Oracle Database 11g Release 2 ? SAP ????????

    - by ?? ?
    US?Blog Oracle Database 11g Release 2 is SAP certified for Unix and Linux platforms. ?????????SAP??????Oracle Database 11g R2????????? ????UNIX???Linux???????????????? Linux x86???x86-64 AIX HP-UX IA64 Solaris SPARC???x64 ??? ?????????????????????????! Advanced Compression Option (table, RMAN backup, expdp, DG Network) Real Application Testing Oracle Database 11g Release 2 Database Vault Oracle Database 11g Release 2 RAC Advanced Encryption for tablespaces, RMAN backups, expdp, DG Network Direct NFS Deferred Segments Online Patching ????SAP???1398634 ??????????????????

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  • Mono Project: How to install Mono framework on Red Hat Linux which is compiled on centOS ?

    - by funwithcoding
    We have Red Hat Enterprise Linux servers at work place. However we dont have Red Hat Linux desktops. So I used CentOS 5.4 to compile the Mono sources and generated the Mono framework for CentOS and tested with some sample codes and I am satisfied. I want to transfer this compiled framework to Red Hat Enterprise Linux 5. How Can I do that? Do I have to compile the Mono framework statically or do I have to copy the linked libraries as well? I am not familiar with linux much. Any help is highly appreciated.

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  • Mono Project: How to install Mono framework on Red Hat Linux which is compiled on centOS ?

    - by funwithcoding
    We have Red Hat Enterprise Linux servers at work place. However we dont have Red Hat Linux desktops. So I used CentOS 5.4 to compile the Mono sources and generated the Mono framework for CentOS and tested with some sample codes and I am satisfied. I want to transfer this compiled framework to Red Hat Enterprise Linux 5. How Can I do that? Do I have to compile the Mono framework statically or do I have to copy the linked libraries as well? I am not familiar with linux much. Any help is highly appreciated.

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  • Why are people trying to connect to me network on TCP port 445?

    - by Solignis
    I was playing with my new syslog server and had my m0n0wall firewall logs forwarded as a test, I noticed a bunch of recent firewall log entries that say that it blocked other WAN IPs from my ISP (I checked) from connecting to me on TCP port 445. Why would a random computer be trying to connect to me on a port apperently used for Windows SMB shares? Just internet garbage? A port scan? I am just curious. here is what I am seeing Mar 15 23:38:41 gateway/gateway ipmon[121]: 23:38:40.614422 fxp0 @0:19 b 98.82.198.238,60653 -> 98.103.xxx.xxx,445 PR tcp len 20 48 -S IN broadcast Mar 15 23:38:42 gateway/gateway ipmon[121]: 23:38:41.665571 fxp0 @0:19 b 98.82.198.238,60665 -> 98.103.xxx.xxx,445 PR tcp len 20 48 -S IN Mar 15 23:38:43 gateway/gateway ipmon[121]: 23:38:43.165622 fxp0 @0:19 b 98.82.198.238,60670 -> 98.103.xxx.xxx,445 PR tcp len 20 48 -S IN broadcast Mar 15 23:38:44 gateway/gateway ipmon[121]: 23:38:43.614524 fxp0 @0:19 b 98.82.198.238,60653 -> 98.103.xxx.xxx,445 PR tcp len 20 48 -S IN broadcast Mar 15 23:38:44 gateway/gateway ipmon[121]: 23:38:43.808856 fxp0 @0:19 b 98.82.198.238,60665 -> 98.103.xxx.xxx,445 PR tcp len 20 48 -S IN Mar 15 23:38:44 gateway/gateway ipmon[121]: 23:38:43.836313 fxp0 @0:19 b 98.82.198.238,60670 -> 98.103.xxx,xxx,445 PR tcp len 20 48 -S IN broadcast Mar 15 23:38:48 gateway/gateway ipmon[121]: 23:38:48.305633 fxp0 @0:19 b 98.103.22.25 -> 98.103.xxx.xxx PR icmp len 20 92 icmp echo/0 IN broadcast Mar 15 23:38:48 gateway/gateway ipmon[121]: 23:38:48.490778 fxp0 @0:19 b 98.103.22.25 -> 98.103.xxx.xxx PR icmp len 20 92 icmp echo/0 IN Mar 15 23:38:48 gateway/gateway ipmon[121]: 23:38:48.550230 fxp0 @0:19 b 98.103.22.25 -> 98.103.xxx.xxx PR icmp len 20 92 icmp echo/0 IN broadcast Mar 15 23:43:33 gateway/gateway ipmon[121]: 23:43:33.185836 fxp0 @0:19 b 98.86.34.225,64060 -> 98.103.xxx.xxx,445 PR tcp len 20 48 -S IN broadcast Mar 15 23:43:34 gateway/gateway ipmon[121]: 23:43:33.405137 fxp0 @0:19 b 98.86.34.225,64081 -> 98.103.xxx.xxx,445 PR tcp len 20 48 -S IN Mar 15 23:43:34 gateway/gateway ipmon[121]: 23:43:33.454384 fxp0 @0:19 b 98.86.34.225,64089 -> 98.103.xxx.xxx,445 PR tcp len 20 48 -S IN broadcast I blacked out part of my IP address for my own safety.

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  • Why is my IMAP port not showing as open ( yet it works? )

    - by Leo
    Ive recently setup Postfix and Dovecot IMAP on a Debian Lenny box. Sending to this domain works fine and reading the email via IMAP works fine too. I'm curious though as to why when running nmap, port 10143 is not shown as open. nmap -sS -O 127.0.0.1 Starting Nmap 4.62 ( http://nmap.org ) at 2011-11-26 21:30 GMT Interesting ports on localhost.localdomain (127.0.0.1): Not shown: 1711 closed ports PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 80/tcp open http 3306/tcp open mysql Am I missing something with NMAP? Thanks Leo

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  • how to pass traffic for port 80 not through openvpn?

    - by moti
    Is there a way to configure OpenVPN clients to route traffic for HTTP port 80 and HTTPS port 443 directly (i.e. not through the VPN), but through the regular default gateway the clients have. All other traffic should go through the VPN. My client is running OpenVPN on Windows and my current configuration looks like this: client dev tun proto tcp remote my-server-2 1194 resolv-retry infinite nobind persist-key persist-tun ca ../keys/ca.crt cert ../keys/client1.crt key ../keys/client1.key ns-cert-type server verb 3 route-metric 1 show-net-up dhcp-renew dhcp-release route-delay 0 120 hand-window 180 management localhost 13010 management-hold management-query-passwords management-forget-disconnect management-signal auth-user-pass

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  • Full speed internal switch bandwidth but per-port set external bandwidth?

    - by garg
    I am in an environment where all the machines are behind a switch that I don't have access to. Each ethernet wall port has limited bandwidth depending on how much has been paid for each port. The problem is that some people have 10Mbps connections and some have 100Mbps connections and this causes problems with local intranet file transfers and operating system/software deployments. Operating systems can take hours to be deployed if the machine is on 10mbps. Do you know if it is possible with most switches to set a rule that would limit bandwidth coming in/going out to an extranet, but keep full bandwidth if the packets are destined to go to a local machine? For example, the internet might be limited to 10Mbps, but internal servers would get gigabit speeds? Thanks

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  • Networking switch setup

    - by Crash893
    I have two 48 port gigabit netgear switches with 2 SFP ports each (i also have two Mini-GBIC copper transceiver modules) Is it best to set the ports up by using the built in ports (ie plug port 1 of switchB into port 48 of switchA and port1 of switchA into the router) or is there an advantage to using the mini-gbic? (lets call the sfp ports 49 and 50) router - port 49 on switchA, port 50 switchA - port 49 SwitchB

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  • How do I connect to the serial console port os a Sunfire 280R?

    - by DrStalker
    We have a Sunfire 280R (old SPARC/Solaris server) that is refusing to come up after being relocated. We're trying to connect to the serial console port, but all we get is random gibberish on the screen. We've tried both connecting with a DB25DB9 adapter and using a DB-25-RJ45 adapter with a cisco RJ45-DB9 adapter to a windows laptop. We're configuring the laptop to 9600 baud, 8 bit, 1 stop bit, no parity. We've tried both no flow control and Xon/Xoff. We get the same results hooking up to the serial port on a working SPARC server, so it's probably something in our setup rather than a fault with the server. How do we get access to to serial console so we can work out what is stopping this box from getting to the network? Is there a special sun adapter we need to get/make to get the serial link working?

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  • Just one client bound to address and port: does it make a difference broadcast versus unicast in terms of overhead?

    - by chrisapotek
    Scenario: I am implementing failed over for a network node, so my idea is to make the master node listens on a broadcast ip address and port. If the master node fails, another failover node will start listening on this broadcast address (and port) and take over. Question: My concern is that I will be using a broadcast IP address just for a single node: the master. The failover node only binds if the master fails, in other words, almost never. In terms of network/traffic overhead, is it bad to talk to a single node through a broadcast address or the network somehow is smart enough to know that nobody else is listening to this broadcast address and kind of treat it as a unicast in terms of overhead? My concern is that I will be flooding my network with packets from this broadcast address even thought I am just really talking to a single node (the master). But I can't use unicast because the failover node has to be able to pick up the master stream quickly and transparently in case it fails.

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  • Do you really need cable management for a cabinet with just switches and patch panels?

    - by ObligatoryMoniker
    We are about to start wiring out a building expansion and our vendor has laid out the racks in the following configuration: Option 1 1U Fiber patch panel 2U Cable Manager 2U 48 port Patch Panel 2U Cable Manager 2U 48 port Patch Panel 2U Cable Manager 1U 48 port Switch 2U Cable Manager 1U 48 port Switch Total = 15U All the patch panels would be connected to the switches with 1ft+ cables fed through cable management. What I am considering instead is: Option 2 1U Fiber patch panel 1U 24 port Patch Panel 1U 48 port Switch 2U 48 port Patch Panel 1U 48 port Switch 2U 48 port Patch Panel Total = 8U All of the patch panels would be connected to the switches with .5 ft cables directly on their face with the top 24 ports of each switch patched to the patch panel above it and the bottom 24 ports of each switch patched to the patch panel beneath it which would not require any cable management. If I go with option 2 it save all of the space used by cable management and allows us to keep adding on switches and patch panels at the end without having to re-cable all of the patch panels above. Our vendor has indicated that this is not best practice and that .5ft cables will introduce cross talk. I could understand that being the case if we were connecting the .5 ft cable directly into another switch but we are connecting it to a patch panel that likely has another 150 ft cable run from the back of the patch panel out to the port in the building in which case the real resulting cable is 150.5 ft at minimum before even connecting it to a PC. It seems like it makes much more sense to go with option 2. It is easier to expand, saves space, and saves money on cabling and cable management. Does this kind of configuration make sense or is there a legitimate reason to choose Option 1 over Option 2?

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  • How to stop IIS7 from listening on a specific IP address and port?

    - by webworm
    I am trying to install Apache on Windows Server 2008. The installation ends with a warning that the IP address I configured Apache to listen on cannot be bound. When I use netstat -a -p tcp to see if any processes are listening on the IP address and port I see several entires .. one of which shows as listening on 0.0.0.0:80. Here is a partial list of the output. Proto Local Address Foreign Address State TCP 0.0.0.0:80 MYSERVERNAME:0 LISTENING This looks to be IIS7 listening on all IP addresses on port 80. The confusing thing is that I stopped IIS7. All websites are shown as stopped. I tried iisreset /STOP as well as using the IIS7 Manager, yet something is still listening on 0.0.0.0:80. I have even made sure that every web site is bound to another IP address other than the one I want freed for Apache. Has anyone else run into this?

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  • The cable of my USB port hub is too short - what to do?

    - by Anna
    Hi, I just bought a new USB port hub "MSY USB 2.0 4-port hub". It has two inputs: A small USB entrance input for external power (?) The problem is that the cable that comes with the hub (small USB on one end, large USB on the other - to input into my computer), is too short for my needs. Is there a solution to this? buying a longer cable might be risky, I know that it might cause problems with power. Is there anything else I can do to make it work? Thanks.

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  • Windows 7 add printer, cancelled, but port still in use. How to remove?

    - by Jake
    I tried to add a network printer at www.xxx.yyy.zzz, but halfway it when it asked for a driver, I cancelled it because I do not have the driver at hand. Later when I try to add again, it tells me the port (www.xxx.yyy.zzz), which is automatically specified as the same as the IP for the printer, is already in use and then suggest www.xxx.yyy.zzz_1 Now, I cannot find the www.xxx.yyy.zzz printer anywhere such that I can remove it and use back the same port. How should I do it? Any ideas? Thanks.

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  • Can't communicate between lan ports on openwrt router

    - by ScaryAardvark
    I've got a WBMR-HP-G300H Buffalo Airstation router on which I've installed the lates OpenWRT software. All is working well (ADSL, WIFI etc) except for one niggle. I can't communicate between lan ports. i.e. if I have one computer connected on lan port 1 and I try to ping another computer on lan port 2 then I get "destination unreachable". I can ping both computers from the router itself and can also ping each computer from a seperate laptop connected wirelessly. All computers are in the same subnet range (10.0.0.?/24). I suspect that I may need to configure a vlan on the switch but everytime I try and do this with various google'ed configuration I keep freezing out all lan-ports and I have to revert back using a wirelessly connected laptop. Here's my /etc/config/network: config interface 'loopback' option ifname 'lo' option proto 'static' option ipaddr '127.0.0.1' option netmask '255.0.0.0' config interface 'lan' option type 'bridge' option proto 'static' option netmask '255.255.255.0' option ipaddr '10.0.0.1' option _orig_ifname 'eth0 wlan0' option _orig_bridge 'true' option ifname 'eth0' config adsl-device 'adsl' option fwannex 'a' option annex 'a2p' config interface 'wan' option _orig_ifname 'nas0' option _orig_bridge 'false' option proto 'pppoa' option encaps 'vc' option atmdev '0' option vci '38' option vpi '0' option username '?????????????' option password '??????????????' Any help would be warmly received. Here's some more config stuff. root@OpenWrt:~# ifconfig -a br-lan Link encap:Ethernet HWaddr 00:24:A5:BD:66:08 inet addr:10.0.0.1 Bcast:10.0.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:226576 errors:0 dropped:346 overruns:0 frame:0 TX packets:269292 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:26771676 (25.5 MiB) TX bytes:183986450 (175.4 MiB) eth0 Link encap:Ethernet HWaddr 00:24:A5:BD:66:08 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) ifb0 Link encap:Ethernet HWaddr 36:60:EC:DF:13:A1 BROADCAST NOARP MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) ifb1 Link encap:Ethernet HWaddr 4A:7B:75:67:54:E0 BROADCAST NOARP MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:780 errors:0 dropped:0 overruns:0 frame:0 TX packets:780 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:58369 (57.0 KiB) TX bytes:58369 (57.0 KiB) mon.wlan0 Link encap:UNSPEC HWaddr 00-24-A5-BD-66-08-00-48-00-00-00-00-00-00-00-00 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2424 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:320188 (312.6 KiB) TX bytes:0 (0.0 B) pppoa-wan Link encap:Point-to-Point Protocol inet addr:81.136.179.204 P-t-P:81.134.80.1 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:258894 errors:0 dropped:0 overruns:0 frame:0 TX packets:212976 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:177341656 (169.1 MiB) TX bytes:25192459 (24.0 MiB) wlan0 Link encap:Ethernet HWaddr 00:24:A5:BD:66:08 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:204063 errors:0 dropped:0 overruns:0 frame:0 TX packets:245516 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:26613140 (25.3 MiB) TX bytes:162799765 (155.2 MiB) root@OpenWrt:~# brctl show bridge name bridge id STP enabled interfaces br-lan 8000.0024a5bd6608 no wlan0 eth0 root@OpenWrt:~# swconfig dev eth0 show Global attributes: enable_vlan: 0 Port 0: pvid: 0 link: port:0 link:up speed:1000baseT full-duplex txflow rxflow Port 1: pvid: 0 link: port:1 link:down Port 2: pvid: 0 link: port:2 link:down Port 3: pvid: 0 link: port:3 link:down Port 4: pvid: 0 link: port:4 link:up speed:100baseT full-duplex txflow rxflow auto Port 5: pvid: 0 link: port:5 link:up speed:100baseT full-duplex txflow rxflow auto Regards Mark.

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  • Setting up virtualbox for outside access

    - by Morgan Green
    I have a computer running a server that my subdomain on my shared hosting account points to. IE subdomain.mydomain.org goes to my home server. Now then; what I'm wanting to do is be able to access my VirtualBox servers through that subdomain and a different port. E.G Ubuntu Virtual Box Server 1 Username:Ubuntuhost1 Password:MyUbuntuHost1 Port:4000 Internal IP: 192.168.1.60 External IP: 24.29.138.45 Ubuntu Virtual Box Server 2 Username:UbuntuHost2 Password:MyUbuntuHost2 Port:4001 Internal IP: 192.168.1.61 External IP: 24.29.138.45 Now I want to be able to access RDP number 1 through Port 4000, but if I access Port 4001 it will connect to the server on port 4001; both using the same subdomain. The next issue is the fact that even though I know what the IP addresses are on the router for the virtualbox hosts through ifconfig it doesn't change the fact that they don't show up on the router. If anyone knows how to configure this to work please help me out because I've been racking my brain to the highest extent I can. Alright; here's an edit to clarify more; Sorry. My ports on the router are edited to forward Port 4000 on Internal IP 192.168.1.63 (My Ubuntu Internal IP address) Now when I go to my Router Home Page my VirtualBox Internal IP Address doesn't show on the attached device listings, so I set up port forwarding anyways to the VirtualBox Internal IP. My end goal is when I connect to mydomain.org and I connect through port 3389 it takes me to my host computers server, but if I put in mydomain.org and go through port 4000 it's going to redirect to my VirtualBox server; Is this even possible? Sorry; I'm trying to clarify the most I think I can I just don't know how else to explain my issue.

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  • Motherboard warning lights when plugging in a display port cord to graphics card?

    - by rllr
    Earlier today, my computer spontaneously shut itself off and refused to turn back on. I tested my PSU and it's operating fine. I unplugged everything and let it sit for a while and it started to make a high pitched coil whine/hiss. When I came back an hour later and plugged in only the power cord, it turned on without any issues. After some troubleshooting, I noticed my motherboard (Intel D975XBX2) has a red CPU led and VR led that come on whenever I plug my monitor into my graphics card via display port. DVI does not cause a similar issue. I was running three monitors off the card, so I need both DVI ports and the display port working. Is it likely my graphics card needs to be replaced, or should I be looking elsewhere to resolve this issue?

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