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• Unable to Connect to just Google Servers

  - by Akshat Mittal

  I am in an extremely strange problem. I am unable to connect to just Google Servers. I am not able to access any site related to Google, Google.com | YouTube | Google+ | Webmaster Tools | jQuery CDN, nothing is working. I am able to open any other website (as I am posting this question on SuperUser), even the Google DNS (8.8.8.8 and 8.8.4.4) are offline. Please Help!! Update 1: Google DNS are back online, YouTube is back online. But website on domain google.com is not working (ex: play.google.com, maps.google.com, google.com/search, etc). Update 2: I am able to access Google.com (only) with (one of) its IP addresss(s) listed below: 74.125.227.41 74.125.227.46 74.125.227.32 74.125.227.33 74.125.227.34 74.125.227.35 74.125.227.36 74.125.227.37 74.125.227.38 74.125.227.39 74.125.227.40 Update 3: I consulted my friends nearby and they said that they are also experiencing the same problem. Seams like this is a major problem in this area (or India !!) The Problem is Now Solved!! I am able to open Google.com

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• E-mail duplication problem

  - by Gavin Osborn

  I have taken out a hosting agreement with a well respected hosting provider for a couple of internet facing servers. We have deployed several applications to these servers which send various e-mails back to us for reporting purposes. Context: Each server runs Windows Server 2003 R2 with the IIS 6.0 SMTP service installed. Each application is configured to use the local instance of IIS to send e-mails. The external IP address of each server is mapped to a particular domain eg: server1.mydomain.com server2.mydomain.com These e-mails are sent from a company domain name and not the domain name of the hosted servers (eg: [email protected]) Symptoms: A small number (<1%) of e-mails sent from these applications appear to be duplicated. These are exact duplicate in terms of both content and message headers. The Fix: I contacted my hosting provider and they told me this was a common problem & instructed me to: Change the HELO response of your mail server service to a FQDN (server1.mydomain.com && server2.mydomain.com) Create a DNS A record that resolves the FQDN of your mail server to the primary IP address of your sending mail server. Create a PTR record that resolves your primary IP address back to your mail server's FQDN In the sending domain's (mycompanydomain.com) DNS zone file, add the appropriate SPF record for your hosted servers. eg: v=spf1 a mx include:mydomain -all The Problem Continues: I made all of the changes as prescribed above, I was a little hesitant because these steps seemed to suggest they were more for stopping your messages getting blocked than they were for stopping them from being duplicated - but I am certainly no expert in these matters. It has been 5 days since I applied this fix and the problem still persists. I am certain that these problems are not a bug in the software because they are 4 different applications installed on 2 different servers, all of whom are exhibiting this strange behaviour. This behaviour has also not been seen in our UAT environment. Were my hosts correct to suggest this fix? If not, does anyone know what could be the cause of this problem? Many Thanks

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• Win Svr 2003 DHCP Bad Addresses

  - by VinceM

  After looking at other posts I still can figure this out. I'll start at the beginning... I inherited this network and I'm not the most knowledgeable about networking... We have a AD DHCP Server that is also our DNS server, We were having some VPN issues (on the same server) and my boss decided to disable routing and remote access, which cleared the settings. We couldn't get it set back up correctly so we rolled back to a backup drive they created a number of months ago. Since rolling back I've had Bad_Address listings in DHCP and there is a number of duplicate records in the DNS Forward Lookup Zones. We have less than 50 devices on the network but I have over 90 Bad Addresses showing. This server is currently running but we get IP address conflicts all the time on pretty much all the computers. I have had people do release and renew but it didn't help... I have also deleted and re-added the scope to no avail either. Any help or ideas would be greatly appreciated and I apologize if I missed another post that has information to help. Thanks, Vince

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• Sendmail doesn't work with iptables, even though smtp and dns are allowed

  - by tom

  I have sendmail installed on Ubuntu 10.04 solely for the use of the php mail() function. This works fine unless iptables is running (I've been using sendmail [email protected] to test this). I think that I have allowed SMTP and DNS (the script I am using to test iptables rules is below, in my version are the actual IPs of my hosts nameservers), but to no avail! iptables --flush iptables -A INPUT -p tcp --dport 22 -j ACCEPT iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --dport 443 -j ACCEPT # Postgres iptables -A INPUT -p tcp --dport 5432 -j ACCEPT # Webmin iptables -A INPUT -p tcp --dport 10000 -j ACCEPT # Ping iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT # sendmail iptables -A INPUT -p tcp --dport 25 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -p tcp --sport 25 -m state --state ESTABLISHED -j ACCEPT # DNS iptables -A INPUT -p udp --sport 53 -s <nameserver1> -j ACCEPT iptables -A INPUT -p udp --sport 53 -s <nameserver2> -j ACCEPT iptables -A INPUT -p tcp --sport 53 -s <nameserver1> -j ACCEPT iptables -A INPUT -p tcp --sport 53 -s <nameserver2> -j ACCEPT iptables -A OUTPUT -p udp --dport 53 -d <nameserver1> -j ACCEPT iptables -A OUTPUT -p udp --dport 53 -d <nameserver2> -j ACCEPT iptables -A OUTPUT -p tcp --dport 53 -d <nameserver1> -j ACCEPT iptables -A OUTPUT -p tcp --dport 53 -d <nameserver2> -j ACCEPT iptables -A INPUT -j DROP # Add loopback iptables -I INPUT 1 -i lo -j ACCEPT

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• Transferring domain from one registrar to another

  - by Macha

  I have a domain from my old web host, which was free with my hosting account. After a few years, I am moving to a VPS. Most of my other domains were registered with Namecheap, so it was just a matter of changing a few DNS records. However, given that my old host does not provide me with a DNS control panel, and I don't want to be paying a full hosting bill for just domains, I'm now looking into transferring it. My old host says there will be a charge of $15 to them. NameCheap's page seems to imply you don't need the current registrar to do anything, but it also seems to be based on sending an email to the one listed in whois. Of course, my old host have whoisguard on the domain so the only email on it is [email protected] (and not a unique [email protected], just [email protected]) which doesn't go to me. Again, there doesn't seem to be an option to disable this. So, is it a case of paying my old host's fee, and paying again for the domain from NameCheap, or is there some other way to transfer my domain? (I'm not really sure which of the trilogy sites this is best for.)

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• Sending mail results in "Sender address rejected: Domain not found"

  - by user1281413

  The setup: WHM/CPanel CentOS 5 server running Exim and Courier for mail services, and BIND for domain name services. I recently moved servers. The old server was running a HIGHLY similar configuration, and all accounts were ported via WHM. However, the server is unable to send, and sometimes receive email. Errors I am seeing (when I do get an error mail back) state: 450 4.1.8 : Sender address rejected: Domain not found Edit for clarity: this is the error response from remote mail servers. Numerous independent mail servers come back with the same error. (Email address is merely one valid example) My first instinct of course was to check the domain records. However, k-t.org appears to have a valid record (including an MX record), even after running it through domain checks on a completely different server elsewhere and online. Note that the issue appears to happen with all the domains hosted on the server, not just k-t.org I have also ensured that a PTR was created. My Googling has only lead me to people who had fairly basic DNS mistakes, but either I'm blind/dumb (possible, DNS is not my strong suite), or it's something that is a bit more archaic. I've run out of ideas, and I can't seem to find anything that could explain why servers are unable to resolve the domains. There doesn't seem to be anything missing or incorrect.

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• Using wildcard domains to serve images without http blocking

  - by iopener

  I read that browsers sometimes block waiting for multiple images from the same host, and I'm trying to do everything I can to speed up page load times. One caveat: I need to serve files over HTTPS. Any opinions about whether this is feasible: Setup a wildcard cert for *.domain.com. Whenever I need an image, generate an number based on a hash mod 5 of the filename, and append it to an 'img' subdomain (eg img1.domain.com, img4.domain.com, img3.domain.com, etc.); the hash will make any filename always use the same subdomain, and therefore the browser should be able to cache the images Configure a dynamic virtualhost record to point all img#. subdomains to /var/www/img I am looking for feedback about this plan. My concerns are: Will I get warnings when my page has https:// links to multiple subdomains? Is the dynamic virtualhost record I'm talking about even possible? Considering the amount of processing this would require, is it likely to even produce any kind of overall benefit? I'm probably averaging a half-dozen images per page, with only half being changed on each page refresh. Thanks in advance for you feedback.

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• Mailgun Is Not Detecting My New MX Records

  - by Tyler Crompton

  When I issue a DiG command to verify my MX records, I get the following output: $ dig example.com MX ; <<>> DiG 9.9.5-3-Ubuntu <<>> example.com MX ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47700 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 5 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;example.com. IN MX ;; ANSWER SECTION: example.com. 85468 IN MX 10 mxa.mailgun.org. example.com. 85468 IN MX 10 mxb.mailgun.org. ;; REMAINDER OF OUTPUT REMOVED FOR BREVITY However, when I click "Check DNS Records Now" on Mailgun, it verifies the changes to the TXT and CNAME records but says that my MX records have not been changed. Type | Priority | Enter This Value | Current Value -----+----------+------------------+-------------------- MX | 10 | mxa.mailgun.org | 10 mail.example.com MX | 10 | mxb.mailgun.org | 10 mail.example.com I updated these records three to fours ago. I know it said to wait up to twenty-four to forty-eight hours. But I feel that if it detected the other DNS changes, then it should detect the MX record changes. Am I being impatient or is this a legitimate concern? What do you suggest I do? Note: I'd create a Mailgun tag for this; I feel that it'd be appropriate, but I don't have enough reputation to do so.

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• OARC's DNSSEC validating resolvers validate all my records but A records

  - by demize

  I have DNS set up with powerdns. It serves my DNS pretty well, and it AXFRs to other slaves. The slaves haven't yet updated to the most recent records, but that doesn't affect the validation, it would appear. Any record I can think of (AAAA, MX, TXT, even the CNAME for www) validates -- except for A records: dig @149.20.64.20 +dnssec www.demize95.com CNAME returns ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 7 while dig @149.20.64.20 +dnssec demize95.com A returns ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 7. The same happens with any other A record I have. I set up DNSSEC with pdnssec, and it does work for all the other records, but it's never validated for my A records. What's the problem here? Also, a side-note: I have to use ISC's DLV to create the chain of trust, since my domain registrar doesn't yet support sending the DS records to the com zone.

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• Can't access site internally, but DNS works

  - by BloodyIron

  1) I have apache2 running a vhost for a website. 2) This apache2 instance is already successfuly setup for other websites on it to be accessible internally and externally. 3) I am using an internal bind9 server to resolve the new website's domain internally to the private IP. This bind9 server is not public facing, nor is it the master server on the internet. 4) The DNS internally resolves to the right IP. 5) Firefox reports "server not found". 6) I have copied the config almost identically to other configs that are known to work (adjusting for proper paths of course). In turn I have reloaded and restarted apache2 repeatedly. 7) I have an entry to forward .org .info .net alternative TLDs to .com in the vhost config for this domain, and my browser goes from .org to .com despite note #5. 8) /var/log/apache2/access.log shows when someone externally tries to access the site, but no activity is observed when someone tries to access internally. Changing the log level does not appear to improve the situation. 9) I am out of ideas, nothing appears to be wrong. Please help? To be explicit. Why is this new site unreachable internally? I would like to clarify on something, even though I have already outlined this. YES I know this system is in a private network. NO it is not going through a router. YES I am using an internal DNS server (bind9) to resolve, and YES it does resolve to the proper internal IP. YES other websites on the same server setup in the same way with internal resolution work right now and have done for a while. Everything for this domain is setup the same as the other working domains as far as I can tell. The other working domains are internally AND externally accessible. This domain I am working with is only currently externally accessible. When I go to it internally firefox tells me "Server not found".

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• Transferring domain from one registrar to another

  - by Macha

  I have a domain from my old web host, which was free with my hosting account. After a few years, I am moving to a VPS. Most of my other domains were registered with Namecheap, so it was just a matter of changing a few DNS records. However, given that my old host does not provide me with a DNS control panel, and I don't want to be paying a full hosting bill for just domains, I'm now looking into transferring it. My old host says there will be a charge of $15 to them. NameCheap's page seems to imply you don't need the current registrar to do anything, but it also seems to be based on sending an email to the one listed in whois. Of course, my old host have whoisguard on the domain so the only email on it is [email protected] (and not a unique [email protected], just [email protected]) which doesn't go to me. Again, there doesn't seem to be an option to disable this. So, is it a case of paying my old host's fee, and paying again for the domain from NameCheap, or is there some other way to transfer my domain? (I'm not really sure which of the trilogy sites this is best for.)

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• Why can't I ping a PC on my home network?

  - by AngryHacker

  Whenever I try to ping another box on my home network, it pings the wrong ip address: C:\Users\Papa>ping macmini Pinging macmini.belkin [208.68.143.55] with 32 bytes of data: Reply from 208.68.143.55: bytes=32 time=50ms TTL=110 As you can see it always appends belkin to anything I try to ping. So I hit up ipconfig and belkin happens to be Connection-specific DNS Suffix: Wireless LAN adapter Wireless Network Connection: Connection-specific DNS Suffix . : belkin IPv4 Address. . . . . . . . . . . : 192.168.2.7 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.2.1 My setup is all DHCP, so I am not sure where belkin is coming from. I looked through all the networking stuff, as you can see below: Bottom line: how do I fix this?

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• Route53 only for wildcard subdomain

  - by Philippe Gerber

  We recently moved our web application to AWS. One thing that is still managed by our old hoster is DNS. OLD HOSTER example.com. NS <Old hoster's name server> example.com. A <ElasticIP on EC2 instance> *.example.com. CNAME example.com. ... I'm now trying to setup and play around with Route53 and use it for name resolution of our EC2 instances. ROUTE53 web-01.aws.example.com. CNAME ec2-xx-xx-xx-xx.eu-west-1.compute.amazonaws.com. web-02.aws.example.com. CNAME ec2-xx-xx-xx-xx.eu-west-1.compute.amazonaws.com. ... Now my question: Is it possible to forward DNS queries for *.aws.example.com to Route53 (ns-xxxx.awsdns-59.co.uk.)? What kind of record would I have to add?

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• Join Domain from VM

  - by Adis

  I have two VMs running on VMWare Player. I use NAT adapter settings. The host machine for VMs is running on corporate network. First VM has Domain controller running and I can log in on that machine using domain credentials. I named domain wm.local When I run IP config on this machine: IP: 192.168.87.132 Def Gataway: 192.168.87.2 DNS server: 192.168.87.2 DHCP server: 192.168.87.254 Second VM cannot join domain. When I try it with domain WM I'm propmted for credentials. And I enter Administrator credentials and than it waits for some time and I get response: "The specified domain either does not exist or could not be contacted" If i type wm.local as domain when trying to join it does not prompt me to login but just shows "An Active Directory Domain Controller (AD DC) for the domain wm.local could not be contacted. And here it takes no time to get this error message. Ipconfig on this machine: IP: 192.168.87.134 Def Gataway: 192.168.87.2 DNS server: 192.168.87.2 DHCP server: 192.168.87.254 I can ping second VM from first one. And I disabled firewalls on both machines. Any ideas? Is there any manual for this?

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• My server cant resolve domains?

  - by Nuker

  I am on a VPS that is pretty much unmanaged so it means im on my own. I did my best to configure it so i can host my own site for other people to see it online but seems like i have network problems because in the last days many of my users report they cant enter my site from my domain and seems like Google and Facebook cant either (this never happened before). Its weird because i can enter my site without problems and so many other people as well. But then i tried to make a php include and i get this error: Warning: include(): php_network_getaddresses: getaddrinfo failed: Name or service not known in I was told that seems like my server cant resolve domains. The includes work if i use IPs instead of domains. So it means i have a DNS problem or something? What can i do to fix it? Im on a Linux 2.6.32-431.11.2.el6.x86_64 on x86_64 CentOS Linux 6.5 Thank you. EDIT: i have this on my resolv.conf # Generated by NetworkManager # No nameservers found; try putting DNS servers into your # ifcfg files in /etc/sysconfig/network-scripts like so: # # DNS1=xxx.xxx.xxx.xxx # DNS2=xxx.xxx.xxx.xxx # DOMAIN=lab.foo.com bar.foo.com nameserver 8.8.8.8 nameserver 8.8.4.4

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• Protocol (or service publish/discovery) to detect devices in network

  - by Gobliins

  we connect some embedded devices in a network. What i am looking for now, is a way to find the devices IP and identify them. We work with Windows PC´s and i am about to write a C# tool that should do this. I thought about send a udp broadcast and in the ack i.e. is the device´s ip, which would mean the device needs a daemon runnig to assign an ip itself. Running a service (like a printer) on the device, and on the PC just lookup for the service. I read about some things like apipa, zeroconf, ipv4 local link, bonjour, dns-sd, mdns, bonjour; They can automatically assign ip´s and publish services in a network. My Question is, can someone recommend me what would be good for my task? -The protocol or Service should be low on ressource (memory/cpu usage) use. -Are there some standard protocolls to use? -Is DNS a good idea or would it be to ressource consumpting just for finding a device´s IP? -Should also work when no dhcp servers are around. edit: To clarify a bit: The IP configuration is automatic. The problem to focus is how to tell the PC which IP in the network (or a direct connection in this vase there would only be one) belongs to the device (identity).

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• Creating a dynamic lacp trunk from HP Procurve 2412zl to Proliant DL380 G7

  - by Maalobs

  I'm configuring an IEEE 802.3ad (LACP) dynamic trunk from a HP Procurve 2412zl (firmware version K.15.07) switch to a HP Proliant DL380 G7 server. The DL380 has 4 NICs and is running Win2008 R2, so I'm teaming the NICs together and leaving everything on the recommended "automatic" setting in the HP NIC configuration tool. The server is one of two, they'll be connected on interfaces F17-F20 and F21-F24 respectively on the switch. I need the servers in a separate VLAN, here is the configuration for the VLAN: vlan 10 name "Lab_Mgmt" untagged B2,F17-F24 ip address 172.22.71.3 255.255.255.0 tagged B21 exit There is a DHCP-relay into the VLAN 10 from another device beyond interface B21. The Advanced Traffic Management Guide says that in order to run a dynamic LACP trunk on another VLAN besides the DEFAULT_VLAN, you need to first enable GVRP and then use "forbid" to stop the interfaces from automatically joining DEFAULT_VLAN when the dynamic trunk is created. GVRP brings some other stuff with it that I don't want or need, so I disable it with "unknown-vlans disable" on all other interfaces. Here is how I do it: procurve-5412zl-1(config)# gvrp procurve-5412zl-1(config)# interface A1-A24,B1-B24,C1-C24,D1-D10,D13-D24,E1-E24, F1-F16,K1,K2 unknown-vlans disable procurve-5412zl-1(config)# vlan 1 forbid F17-F24 procurve-5412zl-1(config)# interface F17-F20 lacp active The result afterwards looks all successful: procurve-5412zl-1(config)# show trunks Load Balancing Method: L3-based (Default), L2-based if non-IP traffic Port | Name Type | Group Type ---- + -------------------------------- --------- + ------ -------- F17 | XYZTEAM3_NIC1 100/1000T | Dyn2 LACP F18 | XYZTEAM3_NIC2 100/1000T | Dyn2 LACP F19 | XYZTEAM3_NIC3 100/1000T | Dyn2 LACP F20 | XYZTEAM3_NIC4 100/1000T | Dyn2 LACP procurve-5412zl-1(config)# vlan 10 procurve-5412zl-1(vlan-10)# show lacp LACP LACP Trunk Port LACP Admin Oper Port Enabled Group Status Partner Status Key Key ---- ------- ------- ------- ------- ------- ------ ------ F17 Active Dyn2 Up Yes Success 0 0 F18 Active Dyn2 Up Yes Success 0 0 F19 Active Dyn2 Up Yes Success 0 0 F20 Active Dyn2 Up Yes Success 0 0 On the Proliant server, the NIC configuration Tool is also indicating that a 802.3ad dynamic trunk has been established. Everything should be good, but it isn't. The server is not getting an IP-address from the DHCP, which it does if I'm not enabling LACP. If I configure the server to a static IP-address on the VLAN 10 subnet, it can't even ping the switch IP-address, much less anything outside of the VLAN. The switch can't ping the server either. I did another attempt with F17-F20 tagged, and checking the box "Default Native Tag (VLAN 10)" in the NIC configuration tool on the server, but there was no difference. Does anyone have any idea what I might have missed?

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• Need to have one network in Windows use static ip address & another use dynamic

  - by Tony_Henrich

  Using Windows 7 64bit. I have a laptop which uses a static ip address when connected at home with wifi and a dynamic ip when using a public wifi. Whenever I switch back to connecting at home, I have to re-enter the info for the static ip. How can I have the home network setting remember its static ip settings regardless of connecting to public dynamic network earlier?

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• Apache mod_proxy dynamic filter

  - by jrhicks

  How can I configure Apache to ProxyBlock content based on something dynamic such as time-of-day or max-use. Basicly I'm curious about the scriptability of Apache. My web-stumbling leads me to believe I can combine mod-proxy and mod-perl in interesting ways to do dynamic filtering. But I'm pretty lost. What are some general instructions, tutorials, books, technologies to begin scripting Apache (or any suitable proxy).

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• Export data to Excel from Silverlight/WPF DataGrid

  - by outcoldman

  Data export from DataGrid to Excel is very common task, and it can be solved with different ways, and chosen way depend on kind of app which you are design. If you are developing app for enterprise, and it will be installed on several computes, then you can to advance a claim (system requirements) with which your app will be work for client. Or customer will advance system requirements on which your app should work. In this case you can use COM for export (use infrastructure of Excel or OpenOffice). This approach will give you much more flexibility and give you possibility to use all features of Excel app. About this approach I’ll speak below. Other way – your app is for personal use, it can be installed on any home computer, in this case it is not good to ask user to install MS Office or OpenOffice just for using your app. In this way you can use foreign tools for export, or export to xml/html format which MS Office can read (this approach used by JIRA). But in this case will be more difficult to satisfy user tasks, like create document with landscape rotation and with defined fields for printing. At this article I'll show you how to work with Excel object from .NET 4 and Silverlight 4 with dynamic objects and give you an approach which allow you to export data from DataGrid Silverlight and WPF controls. Read more...

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• Call for Abstracts Now Open for Microsoft ASP.NET Connections (Closing April 26)

  - by plitwin

  We are putting out a call for abstracts to present at the Fall 2010 Microsoft ASP.NET Connections conference in Las Vegas, Nov 9-13 2009. The due date for submissions is April 26, 2010. For submitting sessions, please use this URL: http://www.deeptraining.com/devconnections/abstracts Please keep the abstracts under 200 words each and in one paragraph. No bulleted items and line breaks, and please use a spell-checker. Do not email abstracts, you need to use the web-based tool to submit them. Please submit at least 3 abstracts, but it would help your chances of being selected if you submitted 5 or more abstracts. Also, you are encouraged to suggest all-day pre or post conference workshops as well. We need to finalize the conference content and the tracks layout in just a few short weeks, so we need your abstracts by April 26th. No exceptions will be granted on late submissions! Topics of interest include (but are not limited to):* ASP.NET Webforms* ASP.NET AJAX* ASP.NET MVC* Dynamic Data* Anything else related to ASP.NET For Fall 2010, we are having a seperate Silverlight conference where you can submit abstracts for Silverlight and Windows 7 Phone Development. In fact, you can use the same URL to submit sessions to Microsoft ASP.NET Connections, Silverlight Connections, Visual Studio Connections, or SQL Server Connections. The URL again is:http://www.deeptraining.com/devconnections/abstracts Please realize that while we want a lot of the new and the cool, it's also okay to propose sessions on the more mundane "real world" stuff as it pertains to ASP.NET. What you will get if selected:* $500 per regular conference talk.* Compensation for full-day workshops ranges from $500 for 1-20 attendees to $2500 for 200+ attendees.* Coach airfare and hotel stay paid by the conference.* Free admission to all of the co-located conferences* Speaker party* The adoration of attendees* etc. Your continued suport of Microsoft ASP.NET Connections and the other DevConnections conferences is appreciated. Good luck and thank you,Paul LitwinMicrosoft ASP.NET Conference Chair

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• Dynamic (C# 4.0) &amp; Var in a nutshell.

  - by mbcrump

  A Var is static typed - the compiler and runtime know the type. This can be used to save some keystrokes. The following are identical. Code Snippet var mike = "var demo"; Console.WriteLine(mike.GetType());  //Returns System.String   string mike2 = "string Demo"; Console.WriteLine(mike2.GetType()); //Returns System.String A dynamic behaves like an object, but with dynamic dispatch. The compiler doesn’t know anything about it at compile time. Code Snippet dynamic duo = "dynamic duo"; Console.WriteLine(duo.GetType()); //System.String //duo.BlowUp(); //A dynamic type does not know if this exist until run-time. Console.ReadLine(); To further illustrate this point, the dynamic type called “duo” calls a method that does not exist called BlowUp(). As you can see from the screenshot below, the compiler is reporting no errors even though BlowUp() does not exist. The program will compile fine. It will however throw a runtimebinder exception after it hits that line of code in runtime. Let’s try the same thing with a Var. This time, we get a compiler error that says BlowUp() does not exist. This program will not compile until we add a BlowUp() method.  I hope this helps with your understand of the two. If not, then drop me a line and I’ll be glad to answer it.

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• Matlab: Why is '1' + 1 == 50? [migrated]

  - by phi

  Matlab has weak dynamic typing, which is what causes this weird behaviour. What I do not understand is what exactly happens, as this result really surprises me. Edit: To clarify, what I'm describing is clearly a result of Matlab storing chars in ASCII-format, which was also mentioned in the comments. I'm more interested in the way Matlab handles its variables, and specifically, how and when it assigns a type/tag to the values. Thanks. '1' is a 1-by-1 matrix of chars in matlab and '123' is a 1-by-3 matrix of chars. As expected, 1 returns a 1-by-1 double. Now if I enter '1' + 1 I get 50 as a 1-by-1 double, and if I enter '123' + 1 I get a 1-by-3 double [ 50 51 52 ] Furthermore, if I type 'a' + 1 the result is 98 in a 1-by-1 double. I assume this has to do with how Matlab stores char-variables in ascii form, but how exactly is it handling these? Are the data actually unityped and tagged, or how does it work? Thanks.

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• Is it justified to use project-wide unique function and variable names to help future refactoring?

  - by kahoon

  Refactoring tools (like ReSharper) often can't be sure whether to rename a given identifier when, for example refactoring a JavaScript function. I guess this is a consequence of JavaScript's dynamic nature. ReSharper solves this problem by offering to rename reasonable lexical matches too. The developer can opt out of renaming certain functions, if he finds that the lexical match is purely accidental. This means that the developer has to approve every instance that will be affected by the renaming. For example let's consider we have two Backbone classes which are used completely independently from each other in our application: var Header = Backbone.View.extend({ close: function() {...} }) var Dialog = Backbone.View.extend({ close: function() {...} }) If you try to rename Dialog's close method to for example closeAndNotify, then ReSharper will offer to rename all occurences of Header's close method just because they are the same lexically prior to the renaming. To avoid this problem, please consider this: var Header = Backbone.View.extend({ closeHeader: function() {...} }) var Dialog = Backbone.View.extend({ closeDialog: function() {...} }) Now you can rename closeDialog unambiguously - given that you have no other classes having a method with the same name. Is it worth it to name my functions this way to help future refactoring?

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• Restrict RDP port based on a Dynamic DNS

  - by webnoob

  Hi All, I want to set a restriction on my firewall (windows firewall on windows 2008) to only allow connections from a certain dynamic DNS. Is this possible? The reason I ask is that this would allow us to just change the IP on the dynamic DNS if our IP changes and means we won't get locked out of RDP. This also allows me to RDP in from other locations that have IP's that are not static by just changing the IP against the DNS. Any ideas. Thanks in advance.

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