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  • IIS not responding with SSL Server Hello

    - by Damien_The_Unbeliever
    I'm having difficulty getting a particular IIS machine to "do" SSL. This is a test environment (one of many) which we've set up "the same" as we have many times previously, but it just doesn't seem to be working. The server is Windows Server 2003 (Version 5.2 (Build 3790.srv03_sp2_gdr.100216-1301 : Service Pack 2)) IIS is hosting 4 sites (including the default site), but only one site is configured for SSL. We're using the same SSL certificate we use on all of our other servers (it's a wildcard cert). (Don't think this is relevant, but including anyway) We've configured the site to require SSL, it has a subdirectory that doesn't require SSL but has an asp page that redirects into SSL. The 403;4 error page for the site is hooked up to this asp page (this is how we do our non-HTTPS into HTTPS transition). Using Microsoft Network Monitor (3.3), I've just run a session against a server where SSL is working. It can pull apart the SSL exchange as the following messages: SSL: Client Hello SSL: Server Hello. Certificate. Server Hello Done SSL: Client Key Exchange. Change Cipher Spec. Encrypted Handshake Message. SSL: Change Cipher Spec. Encrypted Handshake Message However, on our problem server, I only see: SSL: Client Hello. The next packet from the server (from port 443, so it's listening and responding there) contains only 60 bytes, and just seems to have the Tcp headers and not much else (but I'm by no means an expert at deciphering these things). So, where do I look next? Or what additional information do I need to add to this question, and where do I find it?

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  • How configure 2 Lan cards in Windows 7/8 pc one to connect to Internet and other to Local Network

    - by Maharshi Raval
        I am about to install a dedicated VOIP server in our office. It is a 3CX pbx system on Windows 7/8 machine. The environment currently is a Windows SBS 2011 with 8 client machines. I want to use a dedicated broadband connection for the PBX (3CX) box, but the box also needs to be accessible in the local network as we will be using IP Phones and software IP phones. How configure two network cards on PBX box, so that one will be always used to connect to our SIP host over the Internet and the other will be connected to local network accessible from other client pc to connect to the pbx system. It must be noted that currently the Windows SBS 2011 acts as the Primary Domain Controller and gateway for all the client machines.     I cannot use a load balancer as it will conflict and cause issues within the current setup of our SBS2011 as it is also our Exchange Server. Any input is much appreciated. thanks in advance

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  • How configure 2 Lan cards in Windows 7/8 pc one to connect to Internet and other to Local Network

    - by Maharshi Raval
        I am about to install a dedicated VOIP server in our office. It is a 3CX pbx system on Windows 7/8 machine. The environment currently is a Windows SBS 2011 with 8 client machines. I want to use a dedicated broadband connection for the PBX (3CX) box, but the box also needs to be accessible in the local network as we will be using IP Phones and software IP phones. How configure two network cards on PBX box, so that one will be always used to connect to our SIP host over the Internet and the other will be connected to local network accessible from other client pc to connect to the pbx system. It must be noted that currently the Windows SBS 2011 acts as the Primary Domain Controller and gateway for all the client machines.     I cannot use a load balancer as it will conflict and cause issues within the current setup of our SBS2011 as it is also our Exchange Server. Any input is much appreciated. thanks in advance

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  • How to import a text file into powershell and email it, formatted as HTML

    - by Don
    I'm trying to get a list of all Exchange accounts, format them in descending order from largest mailbox and put that data into an email in HTML format to email to myself. So far I can get the data, push it to a text file as well as create an email and send to myself. I just can't seem to get it all put together. I've been trying to use ConvertTo-Html but it just seems to return data via email like "pageFooterEntry" and "Microsoft.PowerShell.Commands.Internal.Format.AutosizeInfo" versus the actual data. I can get it to send me the right data if i don't tell it to ConvertTo-Html, just have it pipe the data to a text file and pull from it, but it's all ran together with no formatting. I don't need to save the file, i'd just like to run the command, get the data, put it in HTML and mail it to myself. Here's what I have currently: #Connects to Database and returns information on all users, organized by Total Item Size, User $body = Get-MailboxStatistics -database "Mailbox Database 0846468905" | where {$_.ObjectClass -eq “Mailbox”} | Sort-Object TotalItemSize -Descending | ft @{label=”User”;expression={$_.DisplayName}},@{label=”Total Size (MB)”;expression={$_.TotalItemSize.Value.ToMB()}} -auto | ConvertTo-Html #Pause for 5 seconds for Exchange write-host -foregroundcolor Green "Pausing for 5 seconds for Exchange" Start-Sleep -s 5 $toemail = "[email protected]" # Emails report to this address. $fromemail = "[email protected]" #Emails from this address. $server = "Exchange.company.com" #Exchange server - SMTP. #Email the report. $email = New-Object System.Net.Mail.MailMessage $email.IsBodyHtml = $True $email.To.Add($toemail) $email.From = $fromemail $email.Subject = "Exchange Mailbox Sizes" $email.Body = $body $client = New-Object System.Net.Mail.SmtpClient $server $client.UseDefaultCredentials = $true $client.Send($email) Any thoughts would be helpful, thanks!

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  • How can I setup a Proxy I can sniff traffic from using an ESX vswitch in promiscuous mode?

    - by sandroid
    I have a pretty specific requirement, detailed below. Here's what I'm not looking for help for, to keep things tidy and on topic: How to configure a standard proxy Any ESX setup required to facilitate traffic sniffing How to sniff traffic Any changes in design (my scope limits me) I need to setup a test environment for a network-sniffing based HTTP app monitoring tool, and I need to troubleshoot a client issue but he only has a prod network, so making changes to the config on client's system "just to try" is costly. The goal here is to create a similar system in my lab, and hit the client's webapp and redirect my traffic - using a proxy - into the lab environment. The reason I want to use a proxy is so that only this specific traffic is redirected for all to see, and not all my web traffic (like my visits to serverfault :P). Everything will run inside an ESX 4.1 machine. In there, there is a traffic collection vswitch in promiscuous mode that is not on the local network for security reasons. The VM containing our listening agent is connected to this vswitch. On the same ESX host, I will setup a basic linux server and install a proxy (either apache + mod_proxy or squid, doesn't matter). I'm looking for ideas on how to deploy this for my needs so I can then figure out how to set it up accordingly. Some ideas I've had were to setup two proxies, and have them talk to eachother through this vswitch in promiscuous mode, but it seems like alot of work. Another idea is a dual-homed proxy, but I've never seen/done that before so I'm not sure how doable it is for what I'd like. I am OK with setting up a second vswitch in promiscuous mode to facilitate this if need be, but I cannot put the vswitch on the lan (which is used so my browser would communicate with the proxy) in promiscuous mode. Any ideas are welcome.

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  • DHCP Relay setup in ubuntu server

    - by jerichorivera
    I have a network appliance (QNO) that works as traffic load balancer and dhcp server. I would like to add a linux server in between the network appliance and the client computers. The linux server will be used to monitor bandwidth usage. My problem is I still want DHCP to be served by the network appliance so that load balancing will still work efficiently. We are afraid that if we setup the linux server as the DHCP server the network appliance will not be able to load balance the traffic if it only sees the linux server as a single client connecting to it. I've been searching all over for a tutorial on how to setup DHCP relay but have not found any. How do I setup DHCP relay on my linux server given there are two NICs attached to it, one connects the linux server to the network appliance and the other connects the linux server to the client computers. EDIT Router (DHCP) ---- [eth0] Linux Server (Relay agent) [eth1] ----- PC (network) Router IP is 192.168.0.100 eth0 is on DHCP eth1 is static 192.168.2.11 (if I need to change this I can) Tried to do dhcrelay -i eth1 192.168.0.100, but the PC was not getting any DHCP lease from the DHCP router. I might be missing something here.

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  • SSH to remote host (edgemarc 4200 or 4500 series routers) and pull arp data

    - by MaQleod
    I've been trying to think of a method to do this for days, but have not come up with anything yet. Ideally, this is what I'm looking to do: From a windows XP machine, I need to open an SSH connection to a remote host, send the arp command, and pull the text results of the command back for use on the client. I will need to parse this data and preferably produce a 2D array of IPs and MAC addresses. There will be no shared keys, this is all done with a username and password that will always be different, they will need to be fed into the command via variables that will be pulled from a database using an autoit script based on the WAN ip of the remote host. Now the actual parsing of the data and creation of the array will be easy if I can just get the text of the arp table. Is there any way to ssh to a remote host, run a command and return the data from that command to the client in a batch script or perl script (it is ok if it writes the text to a file, I can read it out of the file later, I just need it to get to the client)?

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  • How to setup a hyper-v domain with internet access

    - by fynnbob
    First off let me say that I'm not a network admin or server guy, I know very little about that stuff. What I'm trying to do is setup a virtualized domain using hyper-V. Here is the configuration: Physical Server: 4Mb RAM Windows Server 2008 R2 running Hyper-V Virtual Environment: One Domain Controller running Windows Server 2008 R2 One Client running Windows Server 2008 R2 I have been successful in setting up a virtual domain controller and adding a virtual client to that domain controller but I'm stuck at trying to give the virtual Environment Internet access. I can give the client VM Internet access if I remove them from the virtual domain but once I add them back to the virtual domain, Internet access is gone. I've read articles describing many different ways this can be done (using RRAS with NAT, using a wireless connection, etc...) but all of those articles only cover a small piece of the setup and also seem to be geared towards people who know there way around networking and servers which I don't. I'd like to know more but my thing is software development and I have my hands full trying to keep up with everything in that realm. I simply want to setup a virtual domain with Internet access for testing. Can anyone point me to any "for Dummy's" type information on how to setup this type of environment or can anyone provide this kind of step-by-step help. Any help would be very much appreciated.

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  • do I need to create an AD site for VPN network

    - by ykyri
    I have Windows Domain level 2008 R2. There are four GC DC in four different physical locations. I have Kerio-based VPN network for replication and remote administration. Here is how network configured: dc1: local IP: 192.168.0.10 VPN IP: 192.168.1.10 dc2: local IP: 10.10.8.11 VPN IP: 192.168.1.11 dc3: local IP: 10.10.9.12 VPN IP: 192.168.1.12 dc4: local IP: 10.10.10.13 VPN IP: 192.168.1.13 That's simple, replication and all works fine but when running dcdiag on dc3 I have an error: A warning event occurred. EventID: 0x000016AF During the past 4.12 hours there have been 216 connections to this Domain Controller from client machines whose IP addresses don't map to any of the existing sites in the enterprise. <...> The log(s) may contain additional unrelated debugging information. To filter out the needed information, please search for lines which contain text 'NO_CLIENT_SITE:'. The first word after this string is the client name and the second word is the client IP address. Here is netlogon.log lines example: 05/30 12:07:39 DOMAIN.NAME: NO_CLIENT_SITE: dc2 192.168.1.11 05/31 09:52:11 DOMAIN.NAME: NO_CLIENT_SITE: dc4 192.168.1.13 05/31 19:49:31 DOMAIN.NAME: NO_CLIENT_SITE: adm-note 192.168.1.101 07/01 05:16:26 DOMAIN.NAME: NO_CLIENT_SITE: dc1 192.168.1.10 All VPN-joined computers are generates same log line as above. Computer amd-note is for example administrator's notebook, also have VPN. Question is should I add new AD site and bind VPN subnet 192.168.1.0/24 with that site?

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  • Why is it a bad idea to use a customer email as the from address

    - by Crab Bucket
    I've got an application that emails users once they have filled in a form. It uses a [email protected] as a from address. The customer wants it to use the email from the form as the from address which could be anything. I have been told that this is a bad idea due to spoofing/blacklisting and spam. I feel really vague about the exact reason about why this is a bad idea particularly as i've got to try to counsel the client out of this. Can someone explain to me why this is a bad idea. Interestingly the client has used a gmail account as the from address as a demo which not only works fine but has enabled the application to start sending emails (it wouldn't do it before with an email which was [email protected]). Erm - what is going on. I'm told one thing and the opposite works. Sorry - i know this is basic but I could find anything on a google search. Largely I think because I'm having trouble even framing the question. EDIT Thank you everyone - great answers. Interestingly the server sending the email and the mail box that it is going to are both behind the same firewall so the client says they are unconcerned about spam. Oh well.

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  • Interaction between two Clouds

    - by Snehal Masne
    I have setup the Cloud-A with 1 - [CLC+CC] and 2 - [NC] computers. I have another Cloud-B with same configuration. [using the Ubuntu Enterprise Cloud] Both of them working fine individually, in the same LAN. Now if I want to add the NC of Cloud-A to CC of Cloud-B, [in case the resources of Cloud-B are exhausted] how can I make it possible ? I guess this calls for the interoperability stuff... Could you please explain what happens exactly when we ask for instance, the direct interaction happens between the client and NC or it goes through the CLC and CC ? What I want to say is, say there are multiple cloud providers. A user is subscribed to any one of them, say Cloud-A for IaaS. As the requirements are dynamic, all the resources of Cloud-A may get exhausted. There may be another Cloud-B which can provide the services but that Cloud-A can't ask the client to go for Cloud-B. So if it is possible to have some co-ordination between this two providers to share resources mutually, making client fully unaware of whats going on in the background....? Please reply.. I am sorry if I'm doing mistake anywhere... Thanks in advance :) Regards, www.TechProceed.com

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  • Trouble getting started with the STEALTH monitoring package

    - by dlanced
    Is anyone here familiar with the Linux-based STEALTH package (for monitoring FS integrity of client systems)? I'm trying to get started with a very simple configuration, but I'm running into trouble (this is running under Ubuntu 14.04): Config line `USE BASE/root/stealth/10.0.0.79' invalid STEALTH (2.11.02) started at Fri, 30 May 2014 15:25:00 +0000 Program terminated due to non-zero exit value for -type f -exec /usr/bin/sha1sum {} \; (EOC Fri May 30 15:25:00 2014 127) Stealth is creating a binary tmp file in the Stealth server root and generating a "report" file in the start directory, but not much else. Regarding the "USE BASE...invalid" error, and just to be sure, I manually created the directories in /root, but it didn't help. And, by the way, I am running stealth with sudo. Everything seems to be configured correctly: I'm able to ssh into root@client from the stealth machine without a password Here's my "policy" file (I've removed the email directives just for simplicity): DEFINE SSHCMD /usr/bin/ssh [email protected] -T -q exec /bin/bash --noprofile DEFINE EXECSHA1 -xdev -perm +u+s,g+s ( -user root -or -group root ) \ -type f -exec /usr/bin/sha1sum {} \; USE BASE/root/stealth/10.0.0.79 USE SSH ${SSHCMD} USE DD /bin/dd USE DIFF /usr/bin/diff USE PIDFILE /var/run/stealth- USE REPORT report USE SH /bin/sh GET /usr/bin/sha1sum /root/tmp LABEL \nchecking the client's /usr/bin/find program CHECK LOG = remote/binfind /usr/bin/sha1sum /usr/bin/find LABEL \nsuid/sgid/executable files uid or gid root on the / partition CHECK LOG = remote/setuidgid /usr/bin/find / ${EXECSHA1} LABEL \nconfiguration files under /etc CHECK LOG = remote/etcfiles \ /usr/bin/find /etc -type f -not -perm /6111 \ -not -regex "/etc/(adjtime\|mtab)"\ -exec /usr/bin/sha1sum {} \; Any ideas? Thanks,

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  • Openvpn - stuck on Connecting

    - by user224277
    I've got a problem with openvpn server... every time when I trying to connect to the VPN , I am getting a window with login and password box, so I typed my login and password (login = Common Name (user1) and password is from a challenge password from the client certificate. Logs : Jun 7 17:03:05 test ovpn-openvpn[5618]: Authenticate/Decrypt packet error: packet HMAC authentication failed Jun 7 17:03:05 test ovpn-openvpn[5618]: TLS Error: incoming packet authentication failed from [AF_INET]80.**.**.***:54179 Client.ovpn : client #dev tap dev tun #proto tcp proto udp remote [Server IP] 1194 resolv-retry infinite nobind persist-key persist-tun ca ca.crt cert user1.crt key user1.key <tls-auth> -----BEGIN OpenVPN Static key V1----- d1e0... -----END OpenVPN Static key V1----- </tls-auth> ns-cert-type server cipher AES-256-CBC comp-lzo yes verb 0 mute 20 My openvpn.conf : port 1194 #proto tcp proto udp #dev tap dev tun #dev-node MyTap ca /etc/openvpn/keys/ca.crt cert /etc/openvpn/keys/VPN.crt key /etc/openvpn/keys/VPN.key dh /etc/openvpn/keys/dh2048.pem server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt #push „route 192.168.5.0 255.255.255.0? #push „route 192.168.10.0 255.255.255.0? keepalive 10 120 tls-auth /etc/openvpn/keys/ta.key 0 #cipher BF-CBC # Blowfish #cipher AES-128-CBC # AES #cipher DES-EDE3-CBC # Triple-DES comp-lzo #max-clients 100 #user nobody #group nogroup persist-key persist-tun status openvpn-status.log #log openvpn.log #log-append openvpn.log verb 3 sysctl : net.ipv4.ip_forward=1

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  • How to eliminate the domain suffix off my user profile folder when migrating to a new domain?

    - by Jerry Dodge
    We have just upgraded a decade old SBS 2003 server to a brand new SBS 2011 machine. During the process, over 30 other client/server machines on that domain also needed to be dis-joined and re-joined from the old domain to the new one. These domains have different names and is not migrated in any way. It's built from scratch. Since each client machine had very unique user profiles under this domain, we needed to make sure these were all backed up and migrated over to the new domain. For the most part, profiles were migrated with no hassle, just by renaming the user profile folder names. However, in one case, when I log in to my domain account, it creates a profile folder with a suffix of the new domain name. I have replaced all the files in the profile's root which begin with "ntuser" with the files of the new profile. The only problem is half the applications can't find their data, because the folder name is different. How can I change this folder name and maintain this profile on the new domain? I have deleted every user account (except admin), deleted their profiles/folders, removed them from the registry, and made sure every trace of this account was gone. The computer was basically a dummy with only an admin account. Then, I log into the machine under my new domain user account (same username as the old domain). It creates a profile folder with my username plus a suffix extension of the new domain name. The client machine is Windows 7 Ultimate, the old server was SBS 2003, and the new server is SBS 2011.

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  • "Error 53" with local LAN machines after VPN session on server

    - by tim11g
    I have a Windows 2000 server with a Windows 7 client that occasionally gets "error 53" when accessing the server by name (net view \\server). It still works by IP address (net view \\192.168.0.1). The server's primary IP address (as shown in "routing and remote access" as "Gigabit Ethernet" is 192.168.0.1. There is also a secondary IP address shown as "Internal" which is 192.168.0.50 The server also supports VPN. When a VPN user connects, it gets an address in the range of 192.168.0.51 to .59. Normally (when there is no error), when the local LAN client runs "ping server", it resolves to 192.168.0.1. When the Error 53 problem happens, "ping server" resolves to 192.168.0.50. This problem seems to be related to when a user connects or has recently connected to the server VPN. Is there some connection between the VPN services on the server and the DNS services on the server that could cause a local LAN client to become confused about which IP address to use for the server? Or is there a misconfiguration in the VPN or DNS?

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  • which is best smart automatic file replication solution for cloud storage based systems.

    - by TORr0t
    I am looking for a solution for a project i am working on. We are developing a websystem where people can upload their files and other people can download it. (similar to rapidshare.com model) Problem is, some files can be demanded much more than other files. The scenerio is like: I have uploaded my birthday video and shared it with all of my friend, I have uploaded it to myproject.com and it was stored in one of the cluster which has 100mbit connection. Problem is, once all of my friends want to download the file, they cant download it since the bottleneck here is 100mbit which is 15MB per second, but i got 1000 friends and they can only download 15KB per second. I am not taking into account that the hdd is serving same files. My network infrastrucre is as follows: 1 gbit server(client) and connected to 4 Nodes of storage servers that have 100mbit connection. 1gbit server can handle the 1000 users traffic if one of storage node can stream more than 15MB per second to my 1gbit (client) server and visitor will stream directly from client server instead of storage nodes. I can do it by replicating the file into 2 nodes. But i dont want to replicate all files uploadded to my network since it is costing much more. So i need a cloud based system, which will push the files into replicated nodes automatically when demanded to those files are high, and when the demand is low, they will delete from other nodes and it will stay in only 1 node. I have looked to gluster and asked in their irc channel that, gluster cant do such a thing. It is only able to replicate all the files or none of the files. But i need it the cluster software to do it automatically. Any solutions ? (instead of recommending me amazon s3) S

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  • Have servers behind OpenVPN subnet reach connecting clients

    - by imaginative
    I am trying to find some relevant documentation or what directives I need in either the OpenVPN server configuration or client configuration to accommodate for this use case. I have an OpenVPN server that clients connect to. The OpenVPN server can communicate directly with any of the clients already, this is not an issue. The client is able to reach any machine on the private subnet where OpenVPN resides, this is also not an issue. My issue is that the reverse is currently not possible - I have servers on the same subnet as the OpenVPN box that cannot reach any of the connecting clients. I'd like to be able to SSH to them and more, the same way the client can reach the servers behind the OpenVPN subnet. What do I need to do to make this possible? I already have masquerading rules set on the OpenVPN box: iptables -t nat -A POSTROUTING -s 192.168.50.0/24 -o eth0 -j MASQUERADE IP Forwarding is enabled: echo 1 >/proc/sys/net/ipv4/ip_forward I added a route on the server behind the private subnet to be aware of the route: 192.168.50.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 What am I missing?

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  • 100% uptime for a web application

    - by Chris Lively
    We received an interesting "requirement" from a client today. They want 100% uptime with off-site failover on a web application. From our web application's viewpoint, this isn't an issue. It was designed to be able to scale out across multiple database servers, etc. However, from a networking issue I just can't seem to figure out how to make it work. In a nutshell, the application will live on servers within the client's network. It is accessed by both internal and external people. They want us to maintain an off-site copy of the system that in the event of a serious failure at their premises would immediately pick up and take over. Now we know there is absolutely no way to resolve it for internal people (carrier pigeon?), but they want the external users to not even notice. Quite frankly, I haven't the foggiest idea of how this might be possible. It seems that if they lose Internet connectivity then we would have to do a DNS change to forward traffic to the external machines... Which, of course, takes time. Ideas? UPDATE I had a discussion with the client today and they clarified on the issue. They stuck by the 100% number, saying the application should stay active even in the event of a flood. However, that requirement only kicks in if we host it for them. They said they would handle the uptime requirement if the application lives entirely on their servers. You can guess my response.

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  • Why doesn't SSHFS let me look into a mounted directory?

    - by Jan
    I use SSHFS to mount a directory on a remote server. There is a user xxx on client and server. UID and GID are identical on both boxes. I use sshfs -o kernel_cache -o auto_cache -o reconnect -o compression=no \ -o cache_timeout=600 -o ServerAliveInterval=15 \ [email protected]:/mnt/content /home/xxx/path_to/content to mount the directory on the remote server. When I log in as xxx on the client I have no problems. I can cd into /home/xxx/path_to/content. But when I log in on the client as another user zzz and then $ ls -l /home/xxx/path_to I get this d????????? ? ? ? ? ? content and on $ ls -l /home/xxx/path_to/content I get ls: cannot access content: Permission denied When I do $ ls -l /mnt on the remote server I get drwxr-xr-x 6 xxx xxx 4096 2011-07-25 12:51 content What am I doing wrong? The permissions seem to be correct to me. Am I wrong?

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  • Mac OS X will only upload zero-byte files through FTP

    - by tabacitu
    I'm using Mac OS X Lion and i've been having this problem with FTP (any FTP client, mind you. I tried Transmit, FileZilla, Cyberduck and the Terminal, all with the same result) I can browse files in my FTP Client, but when I upload files, the client hangs for a few seconds, then thinks it uploaded the files successfully, but it only creates a new file with one blank line in it. Sometimes, it manages to upload 4-5 lines. It then returns: 226 - Error during read from data connection 226 Transfer aborted But 2xx is a success message. It is not a server issue, since any Windows machine will upload just fine using the same network. Can anybody figure out what the problem is? It renders my mac useless for web development. The problem persists with SFTP and FTP with SSL/TLS. Later edit: Solved! Ok, turns out the problem goes away when I take out my router and connect directly through PPPoE. So the problem is with the router, I thought. But no, the problem is with the mac that connects through a router that connects through a PPPoE and tries to upload using FTP. Pretty specific, I know. The problem is with the MTU (maximum transmission unit). Apparently, mac os x breaks the file into chunks that are too large for the router to send, because the router's MTU was set lower than Mac OS X's. My router's was 1492, which is ok, but my Mac's MTU was 1500, which is unacceptable. I don't even understand why it works directly with PPPoE. Anyway, if you encounter the same problem, this is how you diagnose and fix it: In terminal, run: ifconfig | grep mtu to see what the MTU is for en0 (or en1, mine was en0) If it's 1500, run sudo ifconfig en0 mtu 1300 This should solve it. If so, it may only be until the next restart. You can also change the MTU in System Preferences \ Network \ Ethernet - Advanced \ Hardware

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  • Block SMTP connections from mail domains which don't themselves accept SMTP connection.

    - by bignose
    I'm administrating a mail service for a small business. Their mail host's internet connection is an ADSL service with a permanent IP address. Unfortunately, many misconfigured mail systems will happily deliver to this host, but, when the host attempts to send mail back (e.g. a bounce notice, or a normal response from someone), the original sender refuses to receive connections from this host. That misconfiguration makes their system a one-way mail sender, which is a problem. How can I configure Postfix on this customer's mail host to refuse SMTP sessions that declare a sender domain which itself refuses SMTP from this host? That is, if the SMTP client declares a domain that we can't make SMTP connections back to, then there's not much point accepting the incoming connection in the first place. I'm imagining a late check (after the low-cost checks to winnow most of the rubbish connections) that keeps the client on the other end while it attempts an SMTP client connection back to the declared domain of the sender. If that connection is rejected, the incoming one is also rejected. I'm also open to other suggestions for how this problem might be addressed (short of not using this mail host at all, which isn't an option).

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  • Should I use nginx exclusively, or have it as a proxy to Tomcat (performance related)?

    - by Kevin
    I've planned to create a website that'll be pretty heavy on dynamic content, and want to know what would be the wisest choice for part of my webstack. Right now I'm trying to decide whether I should develop upon nginx, using PHP to deliver the dynamic content, or use nginx as a proxy to Tomcat and use servlets to deliver the dynamic content. I have a good amount of experience with Java, JSP, and servlets, so that's a plus right off the bat. Also, since it is a compiled language, it will execute faster than PHP (it is implied here that Java is around 37x faster than PHP) , and will create the web pages faster. I have no experience with PHP, however i'm under the impression that it is easy to pick up. It's slower than Java, but since the client will only be communicating with nginx, I'm thinking that serving the dynamically created web pages to the client will be faster this way. Considering these things, i'd like to know: Are my assumptions correct? Where does the bottleneck occur: creating pages or serving them back to the client? Will proxying Tomcat with nginx give me any of nginx performance benefits if I'm going to be using Tomcat to generate the dynamic content (keeping in mind my site is going to be heavy in this aspect)? I don't mind learning PHP if, in the end, its going to give me the best performance. I just want to know what would be the best choice from that standpoint.

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  • Strange File-Server I/O Spikes - What Is Causing This?

    - by CruftRemover
    I am currently having a problem with a small Linux server that is providing file-sharing services to four Windows 7 32-bit clients. The server is an AMD PhenomX3 with two Western Digital 10EADS (1TB) drives, attached to a Gigabyte GA-MA770T-UD3 mainboard and running Ubuntu Server 10.04.1 LTS. The client machines are taking an extremely long time to access/transfer data on the file server. Applications often become non-responsive while trying to open files located remotely, or one program attempting to open a file but having to wait will prevent other software from accessing network resources at all. Other examples include one image taking 20 seconds or more to open, and in one instance a user waited 110 seconds for Microsoft Word 2007 to save a document. I had initially thought the problem was network-related, but this appears not to be the case. All cables and switches have been tested (one cable was replaced) for verification. This was additionally confirmed when closing down all client machines and rebooting the server resulted in the hard-drive light staying on solid during the startup process. For the first 15 minutes during boot, logon and after logging on (with no client machines attached), the system displayed a load average of 4 or higher. Symptoms included waiting several minutes for the logon prompt to appear, and then several minutes for the password prompt to appear after typing in a user name. After logon, it also took upwards of 45 seconds for the 'smartctl' man page to appear after the command 'man smartctl' was issued. After 15 minutes of this behaviour, the load average dropped to around 0.02 and the machine behaved normally. I have also considered that the problem is hard-drive-related, however diagnostic programs reveal no drive problems. Western Digital DLG, Spinrite and SMARTUDM show no abnormal characteristics - the drives are in perfect health as far as the hardware is concerned. I have thus far been completely unable to track down the cause of this problem, so any help is greatly appreciated. Requested Information: Output of 'free' hxxp://pastebin.com/mfsJS8HS (stupid spam filter) The command 'hdparm -d /dev/sda1' reports: HDIO_GET_DMA failed: Inappropriate ioctl for device (the BIOS is set to AHCI - I probably should have mentioned that).

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  • Interaction between two Clouds

    - by Snehal Masne
    I have setup the Cloud-A with 1 - [CLC+CC] and 2 - [NC] computers. I have another Cloud-B with same configuration using the Ubuntu Enterprise Cloud Both of them working fine individually, in the same LAN. Now if I want to add the NC of Cloud-A to CC of Cloud-B, [in case the resources of Cloud-B are exhausted] how can I make it possible ? I guess this calls for the interoperability stuff... Could you please explain what happens exactly when we ask for instance, the direct interaction happens between the client and NC or it goes through the CLC and CC ? What I want to say is, say there are multiple cloud providers. A user is subscribed to any one of them, say Cloud-A for IaaS. As the requirements are dynamic, all the resources of Cloud-A may get exhausted. There may be another Cloud-B which can provide the services but that Cloud-A can't ask the client to go for Cloud-B. So if it is possible to have some co-ordination between this two providers to share resources mutually, making client fully unaware of whats going on in the background....?

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  • Every month, scheduled task fails and password must be reset - why?

    - by Ducain
    [NOTE: I posted this originally at StackOverflow but it got no traction there - reposting here.] We have a bit of software installed at a few client locations that runs (via Windows task scheduler) a few times each day. In ONLY ONE of the client locations, we have a unique problem: each month, the task will stop working, after running every day for weeks. Twice now it's failed on the 2nd of the month. When I walk the client through troubleshooting it, we've found that it can't start - access denied. To fix it, we simply re-enter the same exact password, and then off it goes happy as a clam. I've never heard of this issue, and their IT people say they don't have anything running once a month that might cause that. I'm at a complete loss here. Any ideas as to why this might be happening? Further details: Windows XP pro machine. Task is being fired with credentials from a local admin account. Computer is always on, and connected to the net.

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