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  • How to setup complete file access and control on a network

    - by user96270
    I have a media server running ubuntu 12.04 and I want it setup so that any PC on the network (windows etc) has complete access to all files, folders etc with read, write, edit, copy to, copy from permissions. No need for security (IE no password or user name, just select it on the network and start editing). I have samba installed and personal file sharing is enabled but my windows PC cannot see it on the network. I already set up another server as I described but unfortunately I can't remember how or where I found the guides for it. Any on know of a guide that covers what I want?

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  • How much network overhead does TLS add compared to a non-encrypted connection?

    - by Daniel Sterling
    (Approximately) how many more bits of data must be transferred over the network during an encrypted connection compared to an unencrypted connection? IIUC, once the TLS handshake has completed, the number of bits transferred is equal to those transferred during an unencrypted connection. Is this accurate? As a follow up, is transferring a large file over https significantly slower than transferring that file over http, given fast processors and the same (ideal) network conditions?

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  • On a local network, are you able to password protect certain folders and how (in windows xp)?

    - by Derek
    I have a local network set up for my small office which consists of me, the manager, my wife, the secretary, and a few sales people/others. I would like to share passwords over the network and other such things privately to my wife, the secretary, but would not like the sales people and others to have access to it, yet I need the others to have access to other folders/documents that I'd like to share. How would I go about doing this if not by password? Thanks in advance

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  • Linux network programming. What can I start with?

    - by Negai
    Hi everyone! I've recently got interested in Linux network programming and read quite a bit (Beej's Guide to Network Programming). But now I'm confused. I would like to write something to have some practice, but I don't know what exactly. Could please recommend me a couple of projects to start with? Thanks.

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  • Many network adapters at machine, need to find one that is used for traffic in Windows (from .net)

    - by viko
    My application use Web-service. I'm control from what workstation was request and for this send MAC-Address how parameter of all methods. But then I start testing application in real, I found workstations which have many network adapters - Ethernet, Wireless, Bluetooth. When I get MAC-address using next code: var networkAdapters = NetworkInterface.GetAllNetworkInterfaces(); if (networkAdapters == null || networkAdapters.Length == 0) return string.Empty; string address = string.Empty; foreach (var adapter in networkAdapters) { var a = adapter.GetPhysicalAddress(); if (a != null && a.ToString() != string.Empty) { address = a.ToString(); break; } } return address; Sometimes Web-service receive from workstation different MAC-Addresses, but I want get always only one MAC-address. Please, help me.

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  • Event ID: 861 - The Windows Firewall has detected an application listening for incoming traffic

    - by Chris Marisic
    Firstly, my machines aren't compromised any person suggesting such will be DV'd. The security logs on some of my networks client machines (all Windows Xp Sp3) get filled with these useless error messages. Security Failure Audit Detailed Tracking Event ID: 861 User: NT AUTHORITY\NETWORK SERVICE The Windows Firewall has detected an application listening for incoming traffic. Name: - Path: C:\WINDOWS\system32\svchost.exe Process identifier: 976 User account: NETWORK SERVICE User domain: NT AUTHORITY Service: Yes RPC server: No IP version: IPv4 IP protocol: UDP Port number: 55035 Allowed: No User notified: No It's always on various random ports of UDP so setting up a port exception isn't really an option. It's always from svchost or lsass both of which are running services from DLLs. One of the most offending processes seems to the be DnsCache. I have in my global policy under AT < Network < Network Connection < Widnows Firewall < Domain Profile (I haven't changed any standard profile options do both need configured? To allow remote administration and desktop exceptions and have a custom program exception list that has %SystemRoot%\system32\svchost.exe:*:enabled:svchost (Windows won't allow you to add this exception on a local machine but it let me have it on here in the global policy it just doesn't seem to do anything) %SystemRoot%\system32\lsass.exe:*enabled:lsass (I think this one ended all of my LSASS messages) %SystemRoot%\system32\dnsrslvr.dll:*:enabled:dnscache (I tried adding the dll itself to the exception list, this didn't seem to do anything) Is there really any other options left other than disabling the Windows Firewall entirely, disabling auditing entirely or just changing the event viewer to just auto overwrite when needed? I'd much rather fix the problem and get rid of these entries ever being created instead of just trying to cover up the problem.

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  • Group policy waited for the network subsystem

    - by the-wabbit
    In an AD domain with Windows Server 2008 R2 DCs users are complaining about delays in the bootup process of the clients. The group policy log reveals that the client is waiting ~ 20-50 seconds for "the network subsystem": Event 5322, GroupPolicy Group policy waited for 29687 milliseconds for the network subsystem at computer boot. This appears to be domain-specific as machines joining a different domain from the same network do not experience any delays and Event 5322 reports <1000 ms wait times at startup. It happens on virtual and physical machines alike, so it does not look like a hardware- or driver-related issue. Further investigation has shown that the client is taking its time before issuing DHCP requests. In the network traces, I can see IPv6 router solicitations and multicast DNS name registrations as soon as the network driver is loaded and the network connection is reported "up" in the event log (e1cexpress/36). Yet, the DHCPv4 client service seems to take another 15-50 seconds to start (Dhcp-Client/50036), so the IPv4 address remains unconfigured for a while. The DHCP client's messages in the event log are succeeding the service start of the "Sophos Anti-Virus" service (Sophos AV 10.3 package), which I suspect to be the culprit - the DHCP client service dependencies include the TDI Support driver which might be what Sophos is using to intercept network traffic: Network Location Awareness seems to break at startup as a side-effect, I see that off-site DCs are contacted due to what seems like a race condition between the GP client and the DHCP client / NLA service startup. I could set the Group Policy Client service to depend on NLA, yet this still would not eliminate the delay. Also, I am not all that sure that this is a good idea. Is there a known resolution which would eliminate the startup delay?

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  • Troubleshooting unwanted NTP Traffic

    - by Jaxaeon
    A domain controller running Windows Server 2012 is sending NTP and NETBIOS traffic to an address that has never been configured as a time provider. The server logs give no indication that any NTP traffic is failing. The only place I see any evidence of this traffic is in pfSense system logs: (Blocked) Jun 9 08:48:50 DOMAIN 10.0.1.100:123 192.128.127.254:123 UDP (Blocked) Jun 9 08:48:53 DOMAIN 10.0.1.100:137 192.128.127.254:137 UDP As far as I can tell the NTP service is working normally otherwise: DC2.domain.com[10.0.1.101:123]: ICMP: 0ms delay NTP: -0.0131705s offset from DC1.domain.com RefID: DC1.domain.com [10.0.1.100] Stratum: 3 DC1.domain.com *** PDC ***[10.0.1.100:123]: ICMP: 0ms delay NTP: +0.0000000s offset from DC1.domain.com RefID: clock1.albyny.inoc.net [64.246.132.14] Stratum: 2 The time provider NtpClient is currently receiving valid time data from 1.pool.ntp.org,0×1 (ntp.m|0x0|0.0.0.0:123->204.2.134.163:123). The time provider NtpClient is currently receiving valid time data from 0.pool.ntp.org,0×1 (ntp.m|0x0|0.0.0.0:123->64.246.132.14:123). The time service is now synchronizing the system time with the time source 0.pool.ntp.org,0×1 (ntp.m|0x0|0.0.0.0:123->64.246.132.14:123). I've been inside and out of the NTP configuration and cannot find any reason for this traffic. Reverse DNS points the destination address to nothing.attdns.com. pinging nothing.attdns.com from the domain controller in question leads to a response from loopback (127.0.0.2) which makes my head hurt. Any ideas? EDIT1: It should probably be noted that after a dns flush, nslookup 192.128.127.254 returns nothing.attdns.com. 192.128.127.254 is not present in domain.com DNS records. The attdns.com domain is not present in cached lookups. 127.in-addr.arpa is clean of any funkyness. EDIT2: The loopback ping response from nothing.attdns.com is possibly unrelated. Machines on other networks are also displaying this behavior. EDIT3: As mentioned in the comments, I tracked the problem network adapter back to my pfSense VM hosted in esxi 5.5 (I know shame on me for virtualizing a firewall). pfSense was configured to use DC1.domain.com as its primary time provider, but upon changing it back to pool.ntp.org the problem persists. pfSense logs give no indication of NTP misconfiguration. Everywhere I can think to look this VM is identified as 10.0.1.253, so I still have no idea why it’s sending NTP requests as 192.128… Since this firewall was a temporary solution to a problem that no longer exists so I am going to decommission it. EDIT4: The queries were coming from another machine sharing the same virtual adapter as the firewall. The machine has two local adapters: one for LAN, and the other for attached hardware that uses an Ethernet connection. That hardware sits in the the mystery subnet, and the machine is broadcasting NTP requests over both adapters.

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  • Nginx traffic is going to wrong upsteam when mixing named servers and default servers

    - by Morgan
    I have the below config file for nginx. The problem is all traffic is going to upstream clustera. How do I configure nginx to only send traffic for example.com to clustera and all the rest to clusterb? user www-data; worker_processes 1; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; log_format cache '\n*** $remote_addr [$time_local] ' '[$upstream_cache_status] $upstream_response_time ' '$host "$request" ($status) $body_bytes_sent ' '"$http_referer" "$http_user_agent" ' 'Cache-Control: $upstream_http_cache_control ' 'Expires: $upstream_http_expires ' ; access_log /var/log/nginx/access.log cache; sendfile on; keepalive_timeout 65; gzip on; gzip_vary on; gzip_comp_level 6; gzip_proxied any; gzip_disable "MSIE [1-6]\.(?!.*SV1)"; gzip_buffers 16 8k; include /etc/nginx/conf.d/*.conf; proxy_cache_key "$scheme$host$request_uri"; proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=main:10m max_size=1g inactive=30m; upstream clustera { ip_hash; server a.example.com:80; } upstream clusterb { ip_hash; server b.example.com:80; } client_max_body_size 20m; client_body_buffer_size 128k; proxy_connect_timeout 300; proxy_send_timeout 300; proxy_read_timeout 300; # host for example.com should send traffic to clustera server { listen 80; server_name example.com; location ~*(png|jpeg|jpg|gif|ico|css|js)$ { proxy_pass http://clustera; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_cache main; proxy_cache_valid 200 5m; proxy_cache_valid 302 1m; } location / { proxy_pass http://clustera; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } # host for everyone else. traffic goes to clusterb server { listen 80; server_name _; if ( $http_user_agent ~* (spider|crawler|slurp) ) { return 503; } set $slow 0; if ( $http_user_agent ~* (bot) ) { set $slow 1; } if ( $slow ) { set $limit_rate 1k; } location ~*(png|jpeg|jpg|gif|ico|css|js)$ { proxy_pass http://clusterb; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_cache main; proxy_cache_valid 200 5m; proxy_cache_valid 302 1m; } location /images { proxy_pass http://clisterb; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_cache main; proxy_cache_valid 200 5m; proxy_cache_valid 302 1m; } location / { proxy_pass http://clusterb; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } }

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  • How do I set up a shared internet on a network using computer hooked up to a router

    - by Skadlig
    I got a wireless broadband modem (Huawei E1750) hooked up to my computer (call it A., running Windows-7) whose internet I wish to share to my other computer (call it B., also running Windows-7). A. is hooked up to my d-link DIR-600 router using a wired connection to port 1 on the router. B. is connected to the router using a wireless connection. Now I have tried setting up the sharing according to the help files for ICS but I have not been able to get it working. I suspect that there is something in my hardware configuration that is making it difficult. I would appreciate some tips and pointers as to what could be the reason to my problems.

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  • How to setup a Wi-Fi 2-computer network with Internet sharing?

    - by Narek
    I have the following devices: Desktop Computer (Windows XP Professional) Laptop Computer (Windows Vista Home Premium) A USB modem that I want to connect to my Desktop computer (so my Desktop has Internet) And a Wi-Fi router (D-Link, model: DIR-300) that I want to use in order to create a connection between mentioned two computers to be able to share files and what is the most important thing to make my laptop to have access to the Internet. What steps I should do to have this system?

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  • Outlook won't re-connect to exchange after network is re-connected

    - by stan503
    I have a setup at my desk where I connect my computer to a an RJ45 switch that switches between two networks. One network is the corporate network, which is maintained by my company's IT, and the other is my own private network where I do testing (the two networks have to be separated). The corporate network hosts the exchange server where I get e-mail. When I switch from the private network to the corporate network, I expect Outlook to re-connect to the exchange server. However, I have found that sometimes when I come back, Outlook take an extremely long time to re-connect. Send/Receive will give me back the error 'The server is not available' (0x8004011D). It will sit there for 10 minutes to a few hours before it finally re-connects. The only other option is to reboot my computer, which is a huge pain for me since I run multiple VMs on it. This usually happens when I'm connected to the private network for a significant amount of time, so I'm thinking it's because Outlook has cached the network status. Is there a way to force Outlook to do a 'hard' re-connect to the exchange server? I'm using Windows XP SP 3 with Outlook 2007.

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  • Where are Credentials stored for Network Drives on WinXP?

    - by Tom Tresansky
    I have a drive mapped to a folder on a remote machine that I connect to using the Cisco VPN client. The password to the Windows account I use on that remote machine has changed. I had stored the username/password locally, using Window's remember my password feature, so I wouldn't have to enter it every time (the enter user/password login dialog used to appear each time I attempted to open the remote folder, and I would have to look up and enter my credentials). The password to that remote Windows account has changed. Now, I am no longer prompted to enter a user name / password, but instead, upon trying to open the remote folder, receive a message: unknown user name or bad password. How do I view and change these stored credentials?

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  • Windows Network File Transfer to Samba server: “Are you sure you want to copy this file without its properties?”

    - by jimp
    I am transferring a lot of files to a new NAS based on OpenMediaVault, with the Samba 3.5.6 service running. I am transferring from Windows 7 64-bit to the NAS, and on some media files Windows is prompting about losing some property data across the transfer. I have never seen this before when transferring to Samba boxes I have built myself (vs this turnkey solution), so I'm guessing there must be a Samba setting I can change to preserve the file properties in question instead of permanently losing whatever they contain (Date Taken? Exposure? Flash Fired? etc). Or maybe I've just never encountered this before; I'm really not sure. I tried adding ea support = yes and store dos attributes = yes to the [global] section, but the problem remains. The Linux file system is ext4 mounted with user_xattr (full options: defaults,acl,user_xattr,noexec,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0) as Samba requires. Any ideas would be greatly appreciated. Thank you! Samba config: [global] workgroup = WORKGROUP server string = %h server include = /etc/samba/dhcp.conf dns proxy = no log level = 2 syslog = 2 log file = /var/log/samba/log.%m max log size = 1000 syslog only = yes panic action = /usr/share/samba/panic-action %d encrypt passwords = true passdb backend = tdbsam obey pam restrictions = yes unix password sync = no passwd program = /usr/bin/passwd %u passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* . pam password change = yes socket options = TCP_NODELAY IPTOS_LOWDELAY guest account = nobody load printers = no disable spoolss = yes printing = bsd printcap name = /dev/null unix extensions = yes wide links = no create mask = 0777 directory mask = 0777 use sendfile = no null passwords = no local master = yes time server = yes wins support = yes ea support = yes store dos attributes = yes Note: I found this related question, but it explains the loss due to the user trying to transfer from NTFS to FAT32.

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  • Isolating a computer in the network

    - by Karma Soone
    I've got a small network and want to isolate one of the computers from the whole network. My Network: <----> Trusted PC 1 ADSL Router --> Netgear dg834g <----> Trusted PC 2 <----> Untrusted PC I want to isolate this untrusted PC in the network. That means the network should be secure against : * ARP Poisoning * Sniffing * Untrusted PC should not see / reach any other computers within the network but can go out the internet. Static DHCP and switch usage solves the problem of sniffing/ARP poisoning. I can enable IPSec between computers but the real problem is sniffing the traffic between the router and one of the trusted computers. Against getting a new IP address (second IP address from the same computer) I need a firewall with port security (I think) or I don't think my ADSL router supports that. To summarise I'm looking for a hardware firewall/router which can isolate one port from the rest of the network. Could you recommend such a hardware or can I easily accomplish that with my current network?

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