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• Handheld Linux device can't see one wireless network

  - by Nathan

  I'm using a Nokia N810 running OS 2008 (version 5.2008.43-7; should be the latest). It can see networks up and down the street in my neighborhood and can connect to mine using WEP. I can also connect to free networks at restaurants and the like. When I bring it into work, it can't see a wireless network ("No connections available"). When I use netstumbler on my laptop I can see a list of several essids showing green connectivity for the network. I know that the network has its essid broadcast, and I know that it's unsecured. When I run iwlist wlan0 scan, I see several APs with no essid, but I don't see anything with an essid set. I have verified using iwlist that my hardware supports the correct channels and speeds. I know this isn't a Nokia/mobile forum, but it's running what's basically a Debian kernel. Any suggestions on what to do in this case? I'm really frustrated by this. Thanks, Nathan

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• IPv6 static routes

  - by user98651

  I am looking to configure a few hosts with IPv6 on my network. The router (running CentOS 5) is configured with an Hurricane Electric (HE) tunnel which works fine on that host. However, I would like to statically add a few additional hosts on the same LAN to have IPv6 through this tunnel. No, I don't want radvd or dhcpv6 to do the work for me in this case. I already have IPv6 forwarding enabled in sysctl.conf. I am looking for help with the next steps (statically adding the routes). Lets say the IP addresses are as follows: Router: 2001:470:1b07:1:: Host1: 2001:470:1b07:2:: How would I go about making them see each other? Thanks in advance for the help.

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• Bridged network on OS X only gets UDP broadcast traffic

  - by a paid nerd

  I've created a bridged network Mac OS X 10.8.5 using ifconfig and TUNTAP for OS X to bridge my wireless connection, en0, with a virtual interface, tap0, which I can use for guest VMs: $ sudo sysctl -w net.inet.ip.forwarding=1 $ sudo sysctl -w net.link.ether.inet.proxyall=1 $ sudo sysctl -w net.inet.ip.fw.enable=1 $ sudo ifconfig bridge0 create $ sudo ifconfig bridge0 addm en0 addm tap0 $ sudo ifconfig bridge0 up $ ifconfig en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 28:cf:xx:xx:xx:xx inet6 xxxx::xxxx:xxxx:xxxx:xxxx%en0 prefixlen 64 scopeid 0x4 inet 192.168.100.64 netmask 0xffffff00 broadcast 192.168.100.1 media: autoselect status: active bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether ac:de:xx:xx:xx:xx Configuration: priority 0 hellotime 0 fwddelay 0 maxage 0 ipfilter disabled flags 0x2 member: en0 flags=3<LEARNING,DISCOVER> port 4 priority 0 path cost 0 member: tap0 flags=3<LEARNING,DISCOVER> port 8 priority 0 path cost 0 tap0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 ether ca:3d:xx:xx:xx:xx open (pid 88244) However, if I tcpdump -i tap0, I only see broadcast traffic. Shouldn't I see a mirror of everything on en0? (192.168.100.33, the host doing the broadcasting, is another unrelate, noisy server on my LAN.) (I asked a similar question here and will probably close it.)

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• simple network between xp & 7 with cross cable problem...

  - by LostLord

  hi my dear friends : i have a simple network between xp & 7 windowses with cross cable (2 pc home)... ===================================================================== the one with 7 is mother and have 2 lan device (onboard + pci) A. onboard is like this when u go to tcp/ip v4 properties:(4 adsl internet) obtain an ip... preferred dns server : 81.91.129.67 alternate dns server : 4.2.2.4 shared...no permission 4 change so every thing is ok for internet on windows 7. B. the other lan pci card that is connected to pc with xp is like this : 192.168.2.11 255.255.255.0 0.0.0.0 empty empry computer name : cougar workgroup : nethome homeNetwork is disabled (i think that is 4 2 pc's with 7 os not xp) every thing is off in network options except file & printer sharing in public area ===================================================================== pc with xp os is like this : 192.168.2.12 255.255.255.0 192.168.2.11 (mean gateway) 4.2.2.4 8.8.8.8 computer name : tiger workgroup : nethome ===================================================================== at last my little net is ok... mean both have internet , both can see each other by their ip (\\192.168.2.11 or \\192.168.2.12) my problem is when in pc with xp type \\cougar it shows an error about network path! but in pc with 7 \\tiger works perfec. what is the problem in system with xp ? in few days ago this network was ok (search by computer name) when both os were xp , so there is no problem with my cable or devices. another problem is i can not find tiger in my network list in 7 pc \ why? is something wrong with my network? thanks 4 future advance best regards

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• What's the difference between RDP vs VNC ?

  - by Jonathan

  Okay I was playing around with the iPhone Jaadu App and I realized I download the wrong desktop client. So what's really the difference between the RDP and VNC? (because there is Jaadu RDP and Jaadu VNC 2 different app) They both provide the same function? features ?

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• SOHO NETGEAR wireless router disconnects when downloading torrents

  - by Lirik

  I have a NETGEAR WGT624 router at home which dies when there is a heavy torrent load. I open up my torrent client and it downloads for about 5 to 10 minutes and it continues to increase the number of seeds (goes up to 70-80 seeds), but after that the router simply fails and I have to restart it in order to get an internet connection again. Is there any way that I can fix this? New router firmware? Change some router options? Feed it a cookie? Anything?

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• Multiple Homed Windows 2008 Server / Windows 7 Client

  - by Daniel Scott

  I have a small Windows 2008 network, with some Windows 7 clients. The clients are both laptops with docking stations and I would like them to communicate with the Windows 2008 server (for filesharing) through the wired network whilst they're docked. Internet connectivity for all machines (clients and server) is via a Wireless LAN, so the wireless adapter in the Windows 7 clients stays active while they're docked. When the laptops are un-docked, it would be nice to still be able to contact the windows 2008 server for print sharing (and slower file sharing) - hence the server also being on the wireless LAN. The windows 2008 server is running Active Directory, DHCP and DNS. It controls DHCP leases on the wired network and holds the DNS records for "myserver.mycompany.local", which is what the filesharing clients connect to. Ideally I'd like the DNS records to return the wired IP first so that this is the address that the laptops will attempt initially - but there doesn't seem to be a way to do that? At present the server's IP on the wireless LAN comes out of an nslookup above the wired Lan IP. The multi-homing works perfectly - but in the wrong order! Switch on the wireless lan and ping myserver and it goes to the wireless IP. Disable the wireless on the client and do the same ping again and after a couple of seconds it starts pinging the wired address. Does anyone have any suggestions on how to make this work in a predictable order? - or even if it can work. Alternative 1? If it can't work, then would this work: Remove the wireless adapter from the server, put a wireless router/bridge on the wired network (set up to route to/from the wireless LAN's subnet), then configure the clients with two routes to the (now) single IP of the server with metrics favouring direct communication over the wired LAN first? Alternative 2? Should I instead single-home the laptops so all of their connectivity is via the wired-LAN while they're docked? (and route via the windows 2008 server - or a dedicated wireless bridge/router)? My concern here is that I'd like undocking to be seamless - and if the clients are in the middle of downloading something from the internet I wouldn't want whatever they're doing interupted as they switch IP addresses onto the Wireless network. Perhaps this isn't the case and I'm concerned over nothing? Any thoughts? :) UPDATE I seem to have cracked it (at least DNS entries come out in the order I hope for - and pinging the server with various combinations of wired, wireless and both interfaces enabled uses the IP I want) ... I set the binding order of the NICs on the Server (which is acting as Domain Controller, DHCP and DNS server) so that the Wired NIC is before the Wireless adapter. (Start -- type "Network Interfaces" -- Select "View Network Connections" -- Press Alt to show classic dropdown menus -- Advanced -- Advanced Settings) Now, an nslookup (from the client) of the server's hostname returns the Wired IP first, followed by the Wireless IP. The wired IP now seems to be used whenever it's contactable. Incidentally, the metrics on the wired and wireless routes (on the client) also favour the wired LAN (based on Windows' automatically assigned metrics) - but this was always the case, even when I was having trouble getting the wired IP to be "favoured". I'm not entirely sure if this is coincidence - or if a DNS server running on Windows, handing back IP addresses for itself does actually take the binding order of it's own network interfaces into account? It would be interesting to hear from someone who can confirm or deny that (or confirm that the binding order on the server plays a role for some other reason?)

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• No option to connect to wireless network

  - by Casebash

  I don't have any option to connect to wireless. It just doesn't appear in the taskbar at all - even the no wireless networks were found doesn't appear. In network connections, I only have the option of using a wired connection. According to device manager, I have a working VIA Rhine II Fast Ethernet Adapter (this device only appeared after I selected showing hidden devices). I have already attempted restarting the computer a few times. Does anyone have any suggestions?

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• Good way to run commands on remote computer without its own public-facing IP address (Linux Centos)

  - by Chris Dutrow

  Have a few computers running Linux Centos 6.4. They are connected to an unmanaged switch, which in turn, is connected to a router (Verzion Fios issue). What is a good way to "log in" to one of the computers so that I can run commands? Do I need to use SSH, or something different? Since the computers do not have their own public-facing IP addresses, do I need to set up some kind of port forwarding within the router? What is a simple, reliable way to accomplish this? Thanks so much!

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• Other user SSHed from my hardware

  - by Alex

  While logged into our HPC cluster I used w to check out who else was logged in. I happened to notice that it looks like there's another user logged in from my (personal) computer; 19:04:47 up 40 days, 6:39, 44 users, load average: 0.10, 0.14, 0.18 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT ME pts/4 zerg.neuron12. 18:55 0.00s 0.09s 0.04s w SOMEONE_ELSE pts/35 zerg.neuron12. Sat14 2:27m 0.08s 0.08s -bash Is this something I should be worried out - I tried to kill the other session but had a permission denied message. Is it possible we just both have the same hardware name? I'd have thought that if this were the case the server would give one of us a different name (e.g. zerg1) when we logged in to prevent confusion. This is not an area I have any experience with, so any advice would be greatly appreciated!

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• Router and Switch VLAN Configuration for Isolated Network

  - by Ben

  I haven't worked with VLANs much in the past and I was hoping if I could get a good explanation of what I need to setup for this to work. I have a Netgear WNR2000v2 router and a Netgear GS108T smart switch currently in my network. The fourth port on the router connects to port one on the switch. I would like to be able to isolated port 8 on the switch for use as a "guest port" when I bring home malware infested PCs for repair. I figured the VLAN capabilities of the GS108T would be able to do this for me, but I think I have a misunderstanding of how the VLAN actually works. Port 8 needs internet access but should not be able to communicate with the rest of the PCs on the home network. The subnet for the home network is 192.168.1.0/24 and I would like the guest PC to have A) 192.168.1.64 or B) 192.168.2.2. I am reading a lot of stuff about port trunking and VLAN membership, but I am confused as to which setup needs to be in place to make this work. Any help is greatly appreciated! Let me know if there is more information I need to provide. Definitely looking to learn something from this project. Thanks!

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• How to connect my Android to my Laptop wirelessly , to stream data between the two?

  - by Deepun

  I want to stream data from my Laptop PC to my Android phone using TCP or UDP by creating sockets in both the phone and the laptop, but it has to be done wirelessly. How do I connect them to stream the data ? I thought creating an ad-hoc wireless network from my laptop and connecting to it using my Android would work. But my Android is not detecting the ad-hoc network. Is there any other way how I can connect the two ? I downloaded this software called 'connectify' and created a wifi hotspot on my laptop, and successfully connected the two. But will I be able to stream data to my device using this connection ? Can simple direct Bluetooth connection help me in creating sockets in both phone and laptop and stream the data ?

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• How can I get my routers to forward ports correctly?

  - by Giffyguy

  My network currently looks like this (simplified): Note that Router #2 is connected to the LAN interface of Router #1. This should be familiar to anyone who has seen a standard static-IP setup with an additional firewall for a residence or other small building. Router #1 is actually my cable gateway, but since it is a fully functional router/firewall, I am going to refer to it as a router. Now, I need to open various ports in both firewalls for incoming communication to my server - port 80 is a good example. So I've opened up port 80 in Router #2, and so far all incoming traffic at the public IP X.X.X.129 is being routed correctly. The problem is that I also need my server to respond to incoming traffic at the public IP X.X.X.130 on the WAN interface of Router #1. Naturally, I can't just tell Router #1 to forward port 80 to another public IP. Port forwarding is only supported when the traffic is being directed to the LAN subnet. I am willing to restructure my network topology if required, with the following conditions: Router #1 cannot have its WAN IP reassigned - X.X.X.130 is mandatory. Router #1 cannot be moved or disconnected from the cloud. The server cannot be given a second IP address. I would prefer the server to have a private IP address - e.g. 10.0.0.10 I'd like to keep Router #2, but it can have a private IP - e.g. 10.0.1.10 Following these rules, I need to get my server to receive incoming traffic on port 80 from both public IP addresses. Does anyone on SU know if this is possible? So far my only theories have been to set up a static route on either router, or to somehow combine my two subnets into a single subnet.

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• VMware vSwitches and Dell PowerConnect BPDU guard

  - by dunxd

  I am using two Dell PowerConnect 6248 switches to connect a VMware host vSwitch. A discussion of config of Cisco switches for use with VMware advises to set physical ports connected to vSwitch with bpduguard and portfast. However, Dell switches don't have the bpduguard setting for individual ports. I can switch it off globally for all portfast ports, but I don't think I want to do that. Should I: Disable STP on the vSwitch connected ports? Leave STP on and enable portfast on the ports, and forget about bpduguard? Disable bpduguard on all portfast ports via global config Do something else? See also: VMware vSwitches and spanning tree

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• Load balancing with 2 wireless cards

  - by user2544786

  I'm thinking about building a wireless load balancer (if that makes sense). For example, the first wireless card will accept all connections for ip 192.168.1.1 and the second card will serve requests for 192.168.1.2. I know that I can assign both IPs to a single card and all requests will be served by a single wireless card. Would it be better (more bandwidth, more stable connection, etc?) to have two physical cards instead?

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• Finding all domain names that resolve to the same ip?

  - by Janak

  Lately I've been tracking a spammer on craigslist. I recently discovered that he's added a new technique to his arsenal, he registered a whole bunch of domain names but they all resolve to the same ip address. Is there any way to take an ip address and get a list of all the domain names that resolve to that ip?

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• Does HP 8530w support Wifi 802.11n?

  - by FoxyBOA

  According to vendor site HP 8530w supports 802.11n draft mode. My Windows 7 tell me that network card is 5100 ABG and know nothing about N mode (guys from Intel forum mentioned, that 802.11N versions must ended with N letter, e.g. 5100 ABN). Not sure if it matter, but my laptop model id is #FU462EA. How could I check that my Wifi card compliant with 802.11n (I suspect that "draft N" could have two "special" meaning: doesn't work with 802.11n at all or requires special activation of the mode). Any hints are welcome.

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• Booting off windows image through network

  - by Mr. Sir King Osman

  I have a HP st5742, which is a tower that does not have a hard drive and I am trying to boot it off the network, preferably off an image. It was designed along with the program HP Image Manager, however this program has been discontinued by HP and I can not seem to find a way to get a copy. If this helps, I am running my network with windows server 2008 R2 and would like the streaming client to be running windows. I have spent days searching for a way to deploy this machine however I can not seem to find a straight forward program, guide, or way to do this. I am new to this sort of thing but I willing to reading into the subject, all I need is a point in the right direction. Any help would be greatly appreciated.

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• Failed to mount to nfs server with "Program not Registered"

  - by Farrel

  I'm trying to setup nfs server on Fedora 17 and I'm getting "Program not Registered" error when I'm trying to mount. I guess the main reason for this is rpcbind. I'm a newbie in linux, so I don't know what info should I provide you with. Here is some info that might be useful. rpcinfo -p program vers proto port service 100000 4 tcp 111 portmapper 100000 3 tcp 111 portmapper 100000 2 tcp 111 portmapper 100000 4 udp 111 portmapper 100000 3 udp 111 portmapper 100000 2 udp 111 portmapper 100005 1 udp 20048 mountd 100005 1 tcp 20048 mountd 100005 2 udp 20048 mountd 100005 2 tcp 20048 mountd 100005 3 udp 20048 mountd 100005 3 tcp 20048 mountd 100024 1 udp 42223 status 100024 1 tcp 50054 status cat /etc/exports /home/Farrel/prog 192.168.xxx.xxx (ro,sync) service nfs status Redirecting to /bin/systemctl status nfs.service nfs-server.service - NFS Server Loaded: loaded (/usr/lib/systemd/system/nfs-server.service; enabled) Active: active (exited) since Fri, 02 Nov 2012 09:29:04 +0300; 5min ago Process: 924 ExecStartPost=/usr/lib/nfs-utils/scripts/nfs-server.postconfig (code=exited, status=0/SUCCESS) Process: 909 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS ${RPCNFSDCOUNT} (code=exited, status=0/SUCCESS) Process: 885 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS) Process: 864 ExecStartPre=/usr/lib/nfs-utils/scripts/nfs-server.preconfig (code=exited, status=0/SUCCESS) CGroup: name=systemd:/system/nfs-server.service Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable. Firewall is disabled on both systems. I spent a lot of time reading on the topic but all manuals on setting up nfs server lead to "Program not Registered" error. Any how-to-fix-it ideas?

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• All traffic is passed through OpenVPN although not requested

  - by BFH

  I have a bash script on a Ubuntu box which searches for the fastest openvpn server, connects, and binds one program to the tun0 interface. Unfortunately, all traffic is being passed through the VPN. Does anybody know what's going on? The relevant line follows: openvpn --daemon --config $cfile --auth-user-pass ipvanish.pass --status openvpn-status.log There don't seem to be any entries in iptables when I enter sudo iptables --list. The config files look like this: client dev tun proto tcp remote nyc-a04.ipvanish.com 443 resolv-retry infinite nobind persist-key persist-tun persist-remote-ip ca ca.ipvanish.com.crt tls-remote nyc-a04.ipvanish.com auth-user-pass comp-lzo verb 3 auth SHA256 cipher AES-256-CBC keysize 256 tls-cipher DHE-RSA-AES256-SHA:DHE-DSS-AES256-SHA:AES256-SHA There is nothing in there that would direct everything through tun0, so maybe it's a new vagary of Ubuntu? I don't remember this happening in the past.

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• Vista machine hardwired cannot see xp laptop on wireless

  - by Kahega

  I have a laptop with windows xp, connected to my wireless router. I am trying to view the shared files on the laptop with my vista desktop computer. The desktop computer is hardwired to the same router. I can see the desktop pc fine on the xp laptop, and view the shared folders. I cannot see the xp laptop when on the desktop pc. I have tried installing the link update for xp, that is not the issue. I have also tried turning off firewalls, no dice. I have scoured google for this issue, and do not see any resolutions. Any suggestions would be appreciated.

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• Prevent Network Printers Automatically being added to 'Devices and Printers' in Windows 7

  - by Ben

  I think my question is a duplicate of this one, but the original question was never properly answered (the steps described are for Windows XP). I am aware of the option to "Turn off Network Discovery" (under Control Panel All Control Panel Items Network and Sharing Center Advanced sharing settings); I set this option (for both Home/Work and Private) but it doesn't seem to stop the printers getting added, and has the side effect of preventing me from browsing the list of machines on the network (which I need). I've tried the Windows XP registry option - but it doesn't seem to make any difference: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\NoNetCrawling I find it annoying having the printer list cluttered with printers from all over the office which I am never going to use (especially since lots of them no longer physically exist, users just haven't deleted them from their machines). This must be a real problem for people in massive offices with large numbers of printers - but I can't seem to find a lot of people complaining about it - which makes me think I'm missing something obvious. I don't really want to hack the firewall or turn off sharing completely, I still want to select and use network printers and file shares. Any ideas?

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• Proxification rulte for System process

  - by kseen

  I'm trying to configure Microsoft Visual Studio 2010 remote debugging and ran into issue: while connecting to remote computer running MSVSMON, client computer sends SYN request for connection. It makes it under the System process (as I see it in TCPView). As every network apps should be configured to use proxy in our network, I'm trying to add devenv.exe to proxification rules to make its traffic goes thru LAN's proxy server. It doesn't help. So my question is how can I make that low-level-system traffic will go through local area network proxy server?

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• Network / Internet diagnostic tool to locate an error?

  - by Jesper

  Hi, I’m facing some difficulties with the Internet / network at my work and I have trouble locating the precise error and when and how it occurs. The problem is that the client machines in the house sporadic is disconnected to the Internet. I’m some what new so I haven’t that much inside in the network and apparently neither has my predecessor. What I am requesting and hoping you guys knows about is, if there exist some kind of network monitor tool I can install and run and it will periodically check the network, the Internet connection etc. and record to logs. Then, if there suddenly arises a problem some time of the day in some part of the network or the Internet connection, I can check it perhaps the next day. I’ve just downloaded and installed Microsoft Network Monitor 3.3 application and hopeful it can give me some answers on where the instability is located but I still would like a tool to make different checks and test in some time interval. Do anyone know about such a program or another kind of performance / diagnostic tool / method I can use? Sincere Jesper

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• Snap Server 18000 connection help!

  - by sicko666

  I wonder if anyone here can help me. I have a home server setup made up of old secondhand computers, 2 servers running Windows Server 2003, 1 workstation running Windows 7, a 16 port switch & an adsl ethernet modem. All these connect and talk to each other fine but then I got a "Snap Server 18000" and a "Snap disk 30sa" sata array. When I turn the Snap on, it boots past the BIOS, runs a kernel, then displays: This device cannot be managed via the video/kbd/mouse interface. The video is now disabled. You may access the management functions from your web browser. Only, none of the other PCs detect it, so no browser can find it! I have checked all cables, and all LEDs indicate there's a connection. I have installed the windows "iscsi" and the adaptec "Snap Server Manager" on all PCs but still it's not detected. I don't know what else to do, please advise!

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