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  • Forefront TMG 2010: Can you monitor realtime TCP connections and bandwidth on a per-user basis?

    - by user65235
    I'm just starting a trial of ForeFront TMG to use as a proxy server. I know I can get a real time activity monitor and filter on a per user basis, but would like to be able to get a real time activity monitor of all users that I can then sort by bandwidth consumed (enabling me to get a view on who the bandwidth hogs are). Does anyone know if this is possible in Forefront TMG or if a third party product is required? Thanks. JR

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  • Forefront TMG: Can you monitor realtime TCP connections and bandwidth on a per-user basis?

    - by user65235
    I'm just starting a trial of ForeFront TMG to use as a proxy server. I know I can get a real time activity monitor and filter on a per user basis, but would like to be able to get a real time activity monitor of all users that I can then sort by bandwidth consumed (enabling me to get a view on who the bandwidth hogs are). Does anyone know if this is possible in Forefront TMG or if a third party product is required? Thanks. JR

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  • nginx server over https using up all available file handles (upd: infinite loop?)

    - by mmr
    Hi all, So I have an nginx server that's working over https with Sinatra. When I try to download a jnlp file in a configuration that works fine over Mongrel and http (no s), the nginx server fails to serve the file with a 504 error. Subsequent checking of the logs states that this error is due to overflowing the available number of file handles, ie, "24: too many open files". Running sudo lsof -p <nginx worker pid> gets me a huge list of files, all looking like: nginx 1771 nobody 11u IPv4 10867997 0t0 TCP localhost:44704->localhost:https (ESTABLISHED) nginx 1771 nobody 12u IPv4 10868113 0t0 TCP localhost:https->localhost:44704 (ESTABLISHED) nginx 1771 nobody 13u IPv4 10868114 0t0 TCP localhost:44705->localhost:https (ESTABLISHED) nginx 1771 nobody 14u IPv4 10868191 0t0 TCP localhost:https->localhost:44705 (ESTABLISHED) nginx 1771 nobody 15u IPv4 10868192 0t0 TCP localhost:44706->localhost:https (ESTABLISHED) nginx 1771 nobody 16u IPv4 10868255 0t0 TCP localhost:https->localhost:44706 (ESTABLISHED) nginx 1771 nobody 17u IPv4 10868256 0t0 TCP localhost:44707->localhost:https (ESTABLISHED) nginx 1771 nobody 18u IPv4 10868330 0t0 TCP localhost:https->localhost:44707 (ESTABLISHED) nginx 1771 nobody 19u IPv4 10868331 0t0 TCP localhost:44708->localhost:https (ESTABLISHED) nginx 1771 nobody 20u IPv4 10868434 0t0 TCP localhost:https->localhost:44708 (ESTABLISHED) Increasing the number of files that can be opened is no help, because then nginx just blows right past that limit. And no wonder, it looks like it's in some kind of loop to pull all available files. Any idea what's going on, and how to fix it? EDIT: nginx 0.7.63, ubuntu linux, sinatra 1.0 EDIT 2: Here's the offending code. It's sinatra serving jnlp, which I finally figured out: get '/uploader' do #read in the launch.jnlp file theJNLP = "" File.open("/launch.jnlp", "r+") do |file| while theTemp = file.gets theJNLP = theJNLP + theTemp end end content_type :jnlp theJNLP end If I serve this with Sinatra via Mongrel and http, everything works fine. If I serve this with Sinatra and nginx via https, I get the above error. All other parts of the website appear to be equivalent. EDIT: I have since upgraded to passenger 2.2.14, ruby 1.9.1, nginx 0.8.40, openssl 1.0.0a, and no change. EDIT: The culprit appears to be infinite redirects due to using SSL. I don't know how to fix this, other than hosting the jnlp file in the root directory of the server (which I'd rather not do, since it limits me to one jnlp-based app at a time). The relevant lines from nginx.conf: # HTTPS server # server { listen 443; server_name MyServer.org root /My/Root/Dir; passenger_enabled on; expires 1d; proxy_set_header X-FORWARDED_PROTO https; proxy_set_header X_FORWARDED_PROTO https;#the almighty google is not clear on which to use location /upload { proxy_pass https://127.0.0.1:443; } } The funny thing about this is, first, I was putting the jnlp into a directory called 'uploader', not 'upload', but that still appeared to trigger the problem, since that proxy_pass directive appeared in the logs. Second, again, moving the jnlp into root avoided the problem, because there wasn't any of this proxying due to ssl. So, how can I avoid the infinite proxy_pass loop in nginx?

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  • What is the maximum number of TCP connections I can have in Windows Server 2008?

    - by evilfred
    I would like to have as many connections (single connections from many different clients) as humanly possible in a server running on Windows Server 2008, in order to support a Comet-style application. The application is written in C#. The connections will not be chatty, they just need to be open (and stay open). Buying boatloads of memory and fast CPUs are not a problem. As far as I can tell, I will be limited to 65k simultaneous open connections per NIC - the maximum number of ports. Is this accurate? Or can I go beyond 65k connections / NIC somehow? It seems like there are server products for Linux at least that support hundreds of thousands of connections. How do they do this?

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  • Why don't mails show up in the recipient's mailspool?

    - by Jason
    I have postfix dovecot running with local email system on thunderbird. I have two users on by ubuntu, mailuser 1 and mailuser 2 whom i added to thunderbird. Everything went fine, except the users dont have anything on their inbox on thunderbird and sent mails dont get through. Im using maildir as well. Checking /var/log/mail.log reveals this This what is happining: Restarting postfix and dovecot and then sending mail from one user to another user... I believe this line is the problem May 30 18:31:55 postfix/smtpd[12804]: disconnect from localhost[127.0.0.1] Why is it not connecting ? What could be wrong ? /var/log/mail.log May 30 18:30:21 dovecot: imap: Warning: Killed with signal 15 (by pid=1 uid=0 code=kill) May 30 18:30:21 dovecot: master: Warning: Killed with signal 15 (by pid=1 uid=0 code=kill) May 30 18:30:21 dovecot: imap: Server shutting down. in=467 out=475 May 30 18:30:21 dovecot: config: Warning: Killed with signal 15 (by pid=1 uid=0 code=kill) May 30 18:30:21 dovecot: log: Warning: Killed with signal 15 (by pid=1 uid=0 code=kill) May 30 18:30:21 dovecot: anvil: Warning: Killed with signal 15 (by pid=1 uid=0 code=kill) May 30 18:30:21 dovecot: master: Dovecot v2.2.9 starting up (core dumps disabled) May 30 18:30:54 dovecot: imap-login: Login: user=<mailuser2>, method=PLAIN, rip=::1, lip=::1, mpid=12638, TLS, session=<xUfQkaD66gAAAAAAAAAAAAAAAAAAAAAB> May 30 18:31:04 postfix/master[12245]: terminating on signal 15 May 30 18:31:04 postfix/master[12795]: daemon started -- version 2.11.0, configuration /etc/postfix May 30 18:31:55 postfix/postscreen[12803]: CONNECT from [127.0.0.1]:33668 to [127.0.0.1]:25 May 30 18:31:55 postfix/postscreen[12803]: WHITELISTED [127.0.0.1]:33668 May 30 18:31:55 postfix/smtpd[12804]: connect from localhost[127.0.0.1] May 30 18:31:55 postfix/smtpd[12804]: 1ED7120EB9: client=localhost[127.0.0.1] May 30 18:31:55 postfix/cleanup[12809]: 1ED7120EB9: message-id=<[email protected]> May 30 18:31:55 postfix/qmgr[12799]: 1ED7120EB9: from=<[email protected]>, size=546, nrcpt=1 (queue active) May 30 18:31:55 postfix/local[12810]: 1ED7120EB9: to=<mailuser2@mysitecom>, relay=local, delay=0.03, delays=0.02/0.01/0/0, dsn=2.0.0, status=sent (delivered to maildir) May 30 18:31:55 postfix/qmgr[12799]: 1ED7120EB9: removed May 30 18:31:55 postfix/smtpd[12804]: disconnect from localhost[127.0.0.1] May 30 18:31:55 dovecot: imap-login: Login: user=<mailuser1>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=12814, TLS, session=<sD9plaD6PgB/AAAB> This is my postfix main.cf See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination myhostname = server mydomain = mysite.com alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = $mydomain mydestination = mysite.com #relayhost = smtp.192.168.10.1.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 192.168.10.0/24 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all home_mailbox = Maildir / mailbox_command= All ports are listening tcp 0 0 *:imaps *:* LISTEN tcp 0 0 *:submission *:* LISTEN tcp 0 0 *:imap2 *:* LISTEN tcp 0 0 s148134.s148134.:domain *:* LISTEN tcp 0 0 192.168.56.101:domain *:* LISTEN tcp 0 0 10.0.2.15:domain *:* LISTEN tcp 0 0 localhost:domain *:* LISTEN tcp 0 0 *:ssh *:* LISTEN tcp 0 0 *:smtp *:* LISTEN tcp 0 0 localhost:953 *:* LISTEN tcp6 0 0 [::]:imaps [::]:* LISTEN tcp6 0 0 [::]:submission [::]:* LISTEN tcp6 0 0 [::]:imap2 [::]:* LISTEN tcp6 0 0 [::]:domain [::]:* LISTEN tcp6 0 0 [::]:ssh [::]:* LISTEN tcp6 0 0 [::]:smtp [::]:* LISTEN tcp6 0 0 localhost:953 [::]:* LISTEN

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  • The Digital Video Recorder (DVR) is old news, the IP TV is the new generation.

    Its been more than 10 years since the first DVR came out in the US, the idea that you wont be wasting time by programming your video to record a show. Tivo was the first company to bring the idea of a hard disk to store your programs as well as the recurring shows recorded. Its being more than 10 years since that technology advance that improved the live of many families, yet after 10 years the technology hasnt improved much besides all cable and satellite companies provide their own device without...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Keep getting SocketExceptions (6 replies)

    I am using the System.Net.Sockets.NetworkStream to read data from a network connection I keep getting exceptions #### Exception System.Net.Sockets.SocketException E FAIL (11) #### #### Microsoft.SPOT.Net.SocketNative::recv [IP: 0000] #### #### System.Net.Sockets.Socket::Receive [IP: 0018] #### #### System.Net.Sockets.NetworkStream::Read [IP: 005e] #### #### MFToolkit.Net.Web.HttpRequest::Read [IP:...

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  • I have an internal machine with apache that I can access by IP Address but not computer name

    - by Parris
    I have ubuntu machine running lampp. While on the machine I can type localhost or the computers name to access htdocs. From another machine I can only access the machine via its IP Address. This just started happening recently when someone rearranged the network cables and removed a hub sitting between the machine and the network, which makes me think it wasn't all the stable to begin with anyways. Any suggestions on where I should start looking?

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  • Is there a way to setup a hotspot with a domain name rather than IP address?

    - by WagnerMatosUK
    Basically I've setup a hotspot and its currently being accessed through an IP address. I'd like to use a hostname instead. This is for internal use only, meaning the ODROID device which is being used to as Access Point is connected to the internet via ethernet and only a few devices will access the AP. My setup details: Arch Linux on an ODROID U3 device, using hostapd and dhcp server. PS: I'm quite inexperienced with network so I might be missing something obvious here. Thanks in advance

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  • How can I use dig(1) to test GeoDNS resolution for a specific IP?

    - by cnst
    There's a rumour that public domain name resolvers, like Google Public DNS, are still supposed to work with GeoDNS, because there's some field in the requests that lets them specify for which IP address they are doing a resolution, thus the authoritative servers can give a given resolver different resolutions for different final clients. What's this whole thing called as far as RFCs go, and how does one mimic such resolutions, for testing purposes, e.g. with dig(1)? Else, what other tool is available to accomplish said task?

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  • Cisco NAT vs Bridge vs BVI

    - by cjavapro
    The only devices on this particular LAN will all have public IP addresses. Also the public IP address will be configured directly on the machine,,, so we will not translate private/public IP addresses. If we use NAT,, we would have to translate the public IP on the WAN to the public IP on the LAN. The only security feature I expect on the gateway is an access list. I don't really know much about networking, so I am sorry if this question is generic.

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  • Getting IP/WHOIS information from users clicking ads in Google AdWords?

    - by nctrnl
    I am running a Google AdWords campaign and am wondering if I can get any information from the people who click my ads? I already collect statistics on the website, but I get no referer information from the Google ads in the search network, only from the display network. I am also running Google Analytics on the website but I can't find any relevant information there. P.S: Tag suggestion: google-adwords

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  • Monitor number of bytes transferred to/from IP address on port.

    - by Mike
    Can anyone recommend a linux command line tool to monitor the number of bytes transferred between the local server and a specified IP address/port. The equivalent tcpdump command would be: tcpdump -s 0 -i any -w mycapture.trc port 80 host google.com which outputs : 46 packets captured 131 packets received by filter 0 packets dropped by kernel I'd like something similar that outputs: 54 bytes out, 176 bytes in I'd like it to work on RHEL and be free/open-source. It would be good if there was an existing tool which I was just missing too!

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  • IP blocked because: (smtpauth) Failed SMTP AUTH login from - can someone explain?

    - by gdaniel
    Today I had a few users blocked in our server firewall because of: (smtpauth) Failed SMTP AUTH login from Can someone explain the reason? What does it exactly mean? Could someone be using the our website to access SMTP for spamming purpose? UPDATE: Server info: Centos OS with CPanel and WHM. However no one has access to either. Taking a look at the logs it looks like someone repetitively attempted to login with a known existent user/pass.

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  • Keep getting SocketExceptions (6 replies)

    I am using the System.Net.Sockets.NetworkStream to read data from a network connection I keep getting exceptions #### Exception System.Net.Sockets.SocketException E FAIL (11) #### #### Microsoft.SPOT.Net.SocketNative::recv [IP: 0000] #### #### System.Net.Sockets.Socket::Receive [IP: 0018] #### #### System.Net.Sockets.NetworkStream::Read [IP: 005e] #### #### MFToolkit.Net.Web.HttpRequest::Read [IP:...

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  • Microsoft ouvre ses brevets à HTC, y compris pour ses terminaux sous Android : tous unis contre l'iP

    Mise à jour du 28/04/10 Microsoft ouvre son catalogue de brevets à HTC Y compris pour ses terminaux sous Android : tous unis contre l'iPhone ? Les choses se compliquent dans le monde des smartphones. On savait, depuis le procès d'Apple contre HTC, que le fabriquant de l'iPhone prenait à présent très au sérieux la menace d'Android, l'OS de Google dont HTC est un des principaux utilisateurs ? lire ci-avant. Mais on ne s'attendait pas à ce que Microsoft rentre dans un conflit qui ne le concernait, a priori, pas directement. Et pourtant. Pourtant Microsoft vient d'annoncer un accord surprise de partena...

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  • Winsock tcp/ip Socket listening but connection refused, race condition?

    - by Wayne
    Hello folks. This involves two automated unit tests which each start up a tcp/ip server that creates a non-blocking socket then bind()s and listen()s in a loop on select() for a client that connects and downloads some data. The catch is that they work perfectly when run separately but when run as a test suite, the second test client will fail to connect with WSACONNREFUSED... UNLESS there is a Thread.Sleep() of several seconds between them??!!! Interestingly, there is retry loop every 1 second for connecting after any failure. So the second test loops for a while until timeout after 10 minutes. During that time, netstat -na shows the correct port number is in the LISTEN state for the server socket. So if it is in the listen state? Why won't it accept the connection? In the code, there are log messages that show the select NEVER even gets a socket ready to read (which means ready to accept a connection when it applies to a listening socket). Obviously the problem must be related to some race condition between finishing one test which means close() and shutdown() on each end of the socket, and the start up of the next. This wouldn't be so bad if the retry logic allowed it to connect eventually after a couple of seconds. However it seems to get "gummed up" and won't even retry. However, for some strange reason the listening socket SAYS it's in the LISTEN state even through keeps refusing connections. So that means it's the Windoze O/S which is actually catching the SYN packet and returning a RST packet (which means "Connection Refused"). The only other time I ever saw this error was when the code had a problem that caused hundreds of sockets to get stuck in TIME_WAIT state. But that's not the case here. netstat shows only about a dozen sockets with only 1 or 2 in TIME_WAIT at any given moment. Please help.

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