I want to connect to the internet using ethernet cable.

I want to use ethernet cable to connect to the internet. I follow the instructions, I am still unable to connect to the internet with the ethernet cable. I want faster browsing and uploads and download speeds

If you have a router connect an Ethernet cable from the cable/DSL modem to the WAN port on the router. Connect another Ethernet cable from one of the router's LAN ports to the Ethernet port on the computer. Open Network preferences, select the Ethernet port and click on the Advanced button. Click on the TCP/IP tab then select DHCP from the Configure IPv4 drop down menu. Click on the Apply button.
Turn off the computer, router, and modem. Wait at least one minute. First, turn on the modem and wait until the status lights indicate connection to your ISP. Second, turn on the router and wait until the status light shows communication with the modem. Last, turn on the computer.
If you do not have a router, then do the same as the above except that the Ethernet cable connects from the modem's Ethernet port to your computer's Ethernet port.

Similar Messages

Macbook Pro suddenly will not connect to the internet via ethernet cable.

I know this is a long shot... but I figured I would give it a try.
My macbook pro suddenly does not connect to the internet via ethernet cable. Please bear with me, as I am not very tech-savvy - I will try my best to describe the symptoms!
I connect to the internet via ethernet (we don't have wifi). It was working before I went to work, and when I came home I suddenly couldn't get anything to work (I know everyone says this, but I truly didn't mess with anything). Internet browsers just think for awhile and then turn up the 'You are not connected to the internet' error.
I went into my network preferences and curiously, the 'Ethernet' shows a green dot and says 'connected'. However it says 'Authentication server is not responding' underneath the last part that says '802.1X: WPA: eduroam' (I think that is my user profile).
When I go into my 'security' settings I can see that my firewall is off, so that shouldn't be causing any problems.
I've tried restarting the router and computer itself many times. Diagnostics just gets to a certain point and reports back 'Network Diagnostics cannot fix the current networking problems.' I've also tried switching to a different ethernet cable, and I tried both cables out on a PC laptop and it connected without issue. Additionally, I brought my macbook along to a friend's house and it connected to his wifi just fine, so the problem appears to just be with ethernet connections.
I know it's hard to troubleshoot this kind of thing without being there and having a look at the computer yourself, but any tips wouild be greatly appreciated.

As I mentioned above, I am not very tech savvy so I have no idea why a wireless protocol would be showing up there, I'm just listing everything I see in hopes that someone might know something I can try. This is why I am asking for help here - I'm not sure what has happened that has made me unable to connect, especially since it seemingly occured while nobody was using the computer.
I guess I should clarify that I'm not a total hillbilly- normally my firewall is set to 'on', but I set it to 'off' to try and troubleshoot the issues here as I was told that sometimes it can interfere with the computer's ability to connect to the internet. If this is not the case and firewall does not affect anything, I will turn it back on while I try to fix this.
I have tried the method you mentioned above a few times - I actually contacted my ISP earlier this week and they recommended resetting the router like that. They didn't mention any known network issues.

How to connect to the internet using ethernet

I have an iMac 10,1 and am unable to connect it to the internet using an ethernet cable.
I have a more recent Mac Book and I just plugged in the ethernet cable to it, clicked the setting in Network settings, and I was connected.
On the iMac it keeps saying, diagnostics can't fix it etc..?
On the left panel in Diagnostics, Ethernet has a green light, Network Settings an orange light, and ISP a green light (internet and Server are Red).
I'm using Comcast cable, and they just say the settings should appear automatically on a Mac (which they apparently did on my Mac Book!)
Any suggestions, appreciated.
Alan.

From the menu bar, select
           ▹ System Preferences... ▹ Network ▹ Advanced ▹ TCP/IP
What values are shown for the following?
          Configure IPv4
          IPv4 Address
          Subnet Mask
          Router

MacBook will not connect to the internet via ethernet cable anymore.

My MacBook apparently decided the other day that it no longer desired to connect to the internet through an ethernet connection; it still works perfectly through a wireless network. I am a university student and so there is wireless almost everywhere so it's not so bad, but I cannot connect in my dorm and it's becoming a bit of a pain. I have tried to connect through several known working ethernet ports and no matter what my computer thinks it's not even plugged in. It's even more strange because I just woke up one morning and it was no longer working. Everything else it totally normal, save this one little inconvenience. Any ideas?

So I'm having the same problem. I woke up one morning and my macbook's ethernet connection suddenly stopped working. For some reason It wont recognize the cable.... I have tried 3 different cables and theses cables work with my sisters PC so I know the cable is not the issue. Im also living in college dorms which seems to be a commonality with this issue. I've searched for answers all over and I really don't have the time to make it to the mac store anytime soon. My wireless works but it's not allowed in my college dorms for security reasons(lame). Please help!...
Apple needs to formally address this issue.

My web pages aren't loading when connected to the internet through Ethernet cable?

Yesterday my web pages stopped loading on Safari. I tried loading them on google chrome and had the same problem. I then deleted all saved web site data and reset Safari but this still didn't solve the problem. Finally I restarted with safe mode, where the web pages loaded, but slowly, however when I restarted normally the web pages still weren't loading or partially loading. To test whether this was my computer or the ethernet cable I was connected to, I connected to the wifi at my university, where the web pages loaded perfectly. Plus, when connected to the ethernet cable I could Skype, use Spotify etc., it is just the web pages that are causing a problem. Any suggestions how I can fix this? Thank you!

1. This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve the problem.
2. If you don't already have a current backup, back up all data before doing anything else. The backup is necessary on general principle, not because of anything in the test procedure. There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
3. Below are instructions to run a UNIX shell script, a type of program. All it does is to collect information about the state of the computer. That information goes nowhere unless you choose to share it. However, you should be cautious about running any kind of program (not just a shell script) at the request of a stranger on a public message board. If you have doubts, search this site for other discussions in which this procedure has been followed without any report of ill effects. If you can't satisfy yourself that the instructions are safe, don't follow them. Ask for other options.
Here's a summary of what you need to do, if you choose to proceed: Copy a line of text from this web page into the window of another application. Wait for the script to run. It usually takes a few minutes. Then paste the results, which will have been copied automatically, back into a reply on this page. The sequence is: copy, paste, wait, paste again. Details follow.
4. You may have started the computer in "safe" mode. Preferably, these steps should be taken in “normal” mode. If the system is now in safe mode and works well enough in normal mode to run the test, restart as usual. If you can only test in safe mode, do that.
5. If you have more than one user, and the one affected by the problem is not an administrator, then please run the test twice: once while logged in as the affected user, and once as an administrator. The results may be different. The user that is created automatically on a new computer when you start it for the first time is an administrator. If you can't log in as an administrator, test as the affected user. Most personal Macs have only one user, and in that case this section doesn’t apply. Don't log in as root.
6. The script is a single long line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, though you may not see all of it in the browser window, and you can then copy it. If you try to select the line by dragging across the part you can see, you won't get all of it.
Triple-click anywhere in the line of text below on this page to select it:
PATH=/usr/bin:/bin:/usr/sbin:/sbin; clear; Fb='%s\n\t(%s)\n'; Fm='\n%s\n\n%s\n'; Fr='\nRAM details\n%s\n'; Fs='\n%s: %s\n'; Fu='user %s%%, system %s%%'; AC="com.autodesk.AutoCAD com.google.GoogleDrive"; H='^[[:space:]]*((127\.0\.0\.1|::1|fe80::1%lo0)[[:space:]]+local|(255\.){3}255[[:space:]]*broadcast)host[[:space:]]*$'; NS=networksetup; PB="/usr/libexec/PlistBuddy -c Print"; A () { [[ a -eq 0 ]]; }; M () { find -L "$d" -type f | while read f; do file -b "$f" | egrep -lq XML\|exec && echo $f; done; }; AT () { o=`file -b "$1" | egrep -v '^(A.{16}t$|cann)'`; Ps "${1##*/} format"; }; Pc () { o=`grep -v '^ *#' "$2"`; l=`wc -l <<< "$o"`; [[ l -gt 25 ]] && o=`head -n25 <<< "$o"`$'\n'"[$((l-25)) more line(s)]"; Pm "$1"; AT "$1"; }; Pm () { [[ "$o" ]] && o=`sed -E '/^ *$/d; s/^ */ /; s/[-0-9A-Fa-f]{22,}/UUID/g' <<< "$o"` && printf "$Fm" "$1" "$o"; }; Pp () { o=`$PB "$2" | awk -F'= ' \/$3'/{print $2}'`; Pm "$1"; }; Ps () { o=`echo $o`; [[ ! "$o" =~ ^0?$ ]] && printf "$Fs" "$1" "$o"; }; R () { o=; [[ r -eq 0 ]]; }; SP () { system_profiler SP${1}DataType; }; id -G | grep -qw 80; a=$?; A && sudo true; r=$?; t=`date +%s`; clear; { A || echo $'No admin access\n'; A && ! R && echo $'No root access\n'; SP Software | sed '8!d;s/^ *//'; h=(`SP Hardware | awk '/ Id/{print $3}; /Mem/{print $2}'`); o=$h; Ps "Model"; o=$((h[1]<4?h[1]:0)); Ps "Total RAM (GB)"; o=`SP Memory | sed '1,5d;/[my].*:/d'`; [[ "$o" =~ s:\ [^O]|x([^08]|0[^2]|8[^0]) ]] && printf "$Fr" "$o"; o=`SP Diagnostics | sed '5,6!d'`; [[ "$o" =~ Pass ]] || Pm "POST"; p=`SP Power`; o=`awk '/Cy/{print $NF}' <<< "$p"`; o=$((o>=300?o:0)); Ps "Battery cycles"; o=`sed -n '/Cond.*: [^N]/{s/^.*://p;}' <<< "$p"`; Ps "Battery condition"; for b in Thunderbolt USB; do o=`SP $b | sed -En '1d;/:$/{s/ *:$//;x;s/\n//p;};/^ *V.* [0N].* /{s/ 0x.... //;s/[()]//g;s/(.*: )(.*)/ $\2$/;H;};/Apple|Genesy|Intel|SMSC/{s/.//g;h;}'`; Pm $b; done; o=`pmset -g therm | sed 's/^.*C/C/'`; [[ "$o" =~ No\ th|pms ]] && o=; Pm "Thermal conditions"; o=`pmset -g sysload | grep -v :`; [[ "$o" =~ =\ [^GO] ]] || o=; Pm "System load advisory"; o=`nvram boot-args | awk '{$1=""; print}'`; Ps "boot-args"; a=(/ ""); A=(System User); for i in 0 1; do o=`cd ${a[$i]}L*/Lo*/Diag* || continue; for f in *.{cr,h,pa,s}*; do [[ -f "$f" ]] || continue; d=$(stat -f%Sc -t%F "$f"); [[ "$f" =~ h$ ]] && grep -lq "^Thread c" "$f" && f="$f *"; echo "$d ${f%%_2*} ${f##*.}"; done | sort | tail`; Pm "${A[$i]} diagnostics"; done; grep -lq '*$' <<< "$o" && printf $'\n* Code injection\n'; o=`syslog -F bsd -k Sender kernel -k Message CReq 'caught bu|GPU |hfs: Ru|I/O e|last value [1-9]|n Cause: -|NVDA\(|pagin|proc: t|Roamed|SATA W|ssert|Thrott|timed? ?o' | tail -n25 | awk '/:/{$4=""; $5=""};1'`; Pm "Kernel messages"; o=`df -m / | awk 'NR==2 {print $4}'`; o=$((o<5120?o:0)); Ps "Free space (MiB)"; o=$(($(vm_stat | awk '/eo/{sub("\\.",""); print $2}')/256)); o=$((o>=1024?o:0)); Ps "Pageouts (MiB)"; s=( `sar -u 1 10 | sed '$!d'` ); [[ s[4] -lt 85 ]] && o=`printf "$Fu" ${s[1]} ${s[3]}` || o=; Ps "Total CPU usage" && { s=(`ps acrx -o comm,ruid,%cpu | sed '2!d'`); n=$((${#s[*]}-1)); c="${s[*]}"; o=${s[$n]}%; Ps "CPU usage by process \"${c% ${s[$((n-1))]}*}\" with UID ${s[$((n-1))]}"; }; s=(`top -R -l1 -n1 -o prt -stats command,uid,prt | sed '$!d'`); n=$((${#s[*]}-1)); s[$n]=${s[$n]%[+-]}; c="${s[*]}"; o=$((s[$n]>=25000?s[$n]:0)); Ps "Mach ports used by process \"${c% ${s[$((n-1))]}*}\" with UID ${s[$((n-1))]}"; o=`kextstat -kl | grep -v com\\.apple | cut -c53- | cut -d\< -f1`; Pm "Loaded extrinsic kernel extensions"; R && o=`sudo launchctl list | awk 'NR>1 && !/0x|com\.(apple|openssh|vix\.cron)|org\.(amav|apac|calendarse|cups|dove|isc|ntp|openld|post[fg]|x)/{print $3}'`; Pm "Extrinsic daemons"; o=`launchctl list | awk 'NR>1 && !/0x|com\.apple|org\.(x|openbsd)|\.[0-9]+$/{print $3}'`; Pm "Extrinsic agents"; o=`for d in {/,}L*/Lau*; do M; done | egrep -v 'com\.apple\.(CSConfig|server)' | while read f; do ID=$($PB\ :Label "$f") || ID="No job label"; printf "$Fb" "$f" "$ID"; done`; Pm "launchd items"; o=`for d in /{S*/,}L*/StartupItems; do M; done`; Pm "Startup items"; sys=`pkgutil --regexp --only-files --files com.apple.pkg.* | sort | uniq | sed 's:^:/:'`; b=`sed -E '/^.+Lib.+\/Contents\/Info.plist$/!d;s/\/Info.plist$//;/Contents\/./d' <<< "$sys"`; l=`egrep '^/usr/lib/.+dylib$' <<< "$sys"`; [[ "$b" && "$l" ]] && { o=`find -L /S*/L*/{C*/Sec*A,E}* {/,}L*/{A*d,Compon,Ex,In,iTu,Keyb,Mail/B,P*P,Qu*T,Scripti,Sec,Servi,Spo}* -type d -name Contents -prune | grep -Fv "$b" | while read d; do test -f "$d/Info.plist" || continue; ID=$($PB\ :CFBundleIdentifier "$_") || ID="No bundle ID"; printf "$Fb" "${d%/Contents}" "$ID"; done`; Pm "Extrinsic loadable bundles"; o=`find /usr/lib -type f -name *.dylib | grep -Fv "$l"`; Pm "Extrinsic shared libraries"; :; } || echo $'\nReceipts missing'; o=`for e in INSERT_LIBRARIES LIBRARY_PATH; do launchctl getenv DYLD_$e; done`; Pm "Environment"; o=`find -L {,/u*/lo*}/e*/periodic -type f -mtime -10d`; Pm "Modified periodic scripts"; o=`scutil --proxy | grep Prox`; Pm "Proxies"; o=`scutil --dns | awk '/r\[0\] /{if ($NF !~ /^1(0|72\.(1[6-9]|2[0-9]|3[0-1])|92\.168)\./) print $NF; exit}'`; i=`route -n get default | awk '/e:/{print $2}'`; I=`$NS -listnetworkserviceorder | sed -En '/ '$i'\)$/{x;s/^$.+$ //p;q;};x'`; n=`$NS -getdnsservers "$I" | awk '!/^T/{print "not "}'`; Ps "DNS (${n}from DHCP)"; o=`$NS -getinfo "$I" | awk '/k:/{if ($3 !~ "(255\.){3}0") print $3}'`; Ps "Netmask"; R && o=`sudo profiles -P | grep : | wc -l`; Ps "Profiles"; f=auto_master; [[ `md5 -q /etc/$f` =~ ^b166 ]] || Pc $f /etc/$f; for f in fstab sysctl.conf crontab launchd.conf; do Pc $f /etc/$f; done; f=/etc/hosts; Pc "hosts" <(egrep -v "$H" $f ); AT $f; Pc "User launchd" ~/.launchd*; R && Pc "Root crontab" <(sudo crontab -l); Pc "User crontab" <(crontab -l | sed -E 's:/Users/[^/]+/:/Users/USER/:g'); R && o=`sudo defaults read com.apple.loginwindow LoginHook`; Pm "Login hook"; LD="$(`find /S*/*/F* -type f -name lsregister | head -n1` -dump)"; o=`for ID in $AC; do [[ "$LD" =~ $ID ]] && echo $ID; done`; Pm "Application check"; Pp "Global login items" /L*/P*/loginw* Path; Pp "User login items" L*/P*/*loginit* Name; Pp "Safari extensions" L*/Saf*/*/E*.plist Bundle | sed -E 's/(\..*$|-[1-9])//g'; o=`find ~ $TMPDIR.. $ -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $ | wc -l`; Ps "Restricted user files"; cd; o=`SP Fonts | egrep 'id: N|te: Y' | wc -l`; Ps "Font problems"; o=`find L*/{Con,Pref}* -type f ! -size 0 -name *.plist | while read f; do plutil -s "$f" >&- || echo $f; done`; Pm "Bad plists"; d=(Desktop L*/Keyc*); n=(20 7); for i in 0 1; do o=`find "${d[$i]}" -type f -maxdepth 1 | wc -l`; o=$((o<=n[$i]?0:o)); Ps "${d[$i]##*/} file count"; done; o=; [[ UID -eq 0 ]] && o=root; Ps "UID"; o=$((`date +%s`-t)); Ps "Elapsed time (s)"; } 2>/dev/null | pbcopy; exit 2>&-
Copy the selected text to the Clipboard by pressing the key combination command-C.
7. Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Click anywhere in the Terminal window and paste (command-V). The text you pasted should vanish immediately. If it doesn't, press the return key.
8. If you see an error message in the Terminal window such as "syntax error," enter
exec bash
and press return. Then paste the script again.
9. If you're logged in as an administrator, you'll be prompted for your login password. Nothing will be displayed when you type it. You will not see the usual dots in place of typed characters. Make sure caps lock is off. Type carefully and then press return. You may get a one-time warning to be careful. If you make three failed attempts to enter the password, the test will run anyway, but it will produce less information. In most cases, the difference is not important. If you don't know the password, or if you prefer not to enter it, press the key combination control-C or just press return three times at the password prompt. Again, the script will still run.
If you're not logged in as an administrator, you won't be prompted for a password. The test will still run. It just won't do anything that requires administrator privileges.
10. The test may take a few minutes to run, depending on how many files you have and the speed of the computer. A computer that's abnormally slow may take longer to run the test. While it's running, there will be nothing in the Terminal window and no indication of progress. Wait for the line
[Process completed]
to appear. If you don't see it within half an hour or so, the test probably won't complete in a reasonable time. In that case, close the Terminal window and report the results. No harm will be done.
11. When the test is complete, quit Terminal. The results will have been copied to the Clipboard automatically. They are not shown in the Terminal window. Please don't copy anything from there. All you have to do is start a reply to this comment and then paste by pressing command-V again.
If any private information, such as your name or email address, appears in the results, anonymize it before posting. Usually that won't be necessary.
12. When you post the results, you might see the message, "You have included content in your post that is not permitted." It means that the forum software has misidentified something in the post as a violation of the rules. If that happens, please post the test results on Pastebin, then post a link here to the page you created.
Note: This is a public forum, and others may give you advice based on the results of the test. They speak only for themselves, and I don't necessarily agree with them.
Copyright © 2014 by Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Terms of Use of the Apple Support Communities website ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

Windows 8.1 laptop cannot connect to the internet using USB Mobile Broadband stick.

I bought a new laptop and it came with Windows 8.1 installed. Well, things worked perfectly until I wanted to connect to the internet using my mobile broadband USB stick. I installed the software that came with the stick, and my laptop recognize
the stick but I still cant connect to the internet. The stick workes perfect in my Windows 7 and Windows 8 laptops, but IT DONT CONNECT WITH MY WINDOWS 8.1 LAPTOP. What can I do to troubleshoot this???
HOPE I AM SPECIFIC ENOUGH THOU...

The PC Repair Guy,
If you haven't already, verify that you can connect to the internet through some other means such as Wi-Fi or Ethernet with your laptop to rule out any network setting issues. If you are able to connect successfully to the internet, use that opportunity
to make sure you have
Windows 8.1 Update installed as well as any other applicable updates your laptop may require.
You may also want to check the
Windows Compatibility Center to make sure that your device is compatible with Windows 8.1.
Another possibility is that the driver your laptop is installing for the device isn't the correct one. Check the device manufacturer's site for the most up to date driver they have available for Windows 8.1.
Hope this helps!
Mike
Windows Outreach Team – IT Pro

My Macbook Pro cannot connect to the internet using an ethernet cord.

My Macbook Pro cannot connect to the internet using an ethernet cord. It was working fine for weeks, then all of a sudden just stopped. What could the problem be?

Hi bean07670,
If you are having an issue with the Ethernet connection on your MacBook Pro, you may find the following article helpful:
Mac OS X: Troubleshooting a cable modem, DSL, or LAN Internet connection
http://support.apple.com/kb/TS1317
Regards,
- Brenden

I have a desktop computer with xp Pro windows. I updated from Firefox 3.6 to 4.0 and found I could not connect to the internet using this updated bowser. I had to remove 4.0 and reinstall 3.6 to restore a working version of Mozilla. Why did this occur?

I tried to update my browser from 3.6 to4.0. On restarting the computer I found I could no longer connect to the internet. I then connected to the internet using Internet Explorer and removed the mozilla browser and reinstall Mozilla firefox 4.0. Again the browser using this updated version didn't work. So reinstalled Mozilla firefox 3.6 and it worked.
It appearsMozilla firefox 4.0 has a problem.
My operating system is Windows XP pro.

Uninstall 2.x totally
Use CCleaner Registry tool
Do whatever you need to to nuke the existing Apple programs and folders hidden here and there also.
BC 2.2 was XP and Vista only

Could my ipad2 connects to the Internet using SIM card or USB Modem?

Could my ipad2 connects to the Internet using SIM card or USB Modem?

If you have a 3G iPad, it can connect to the internet using cellular data. As the iPad has no USB port, you can't connect a USB modem. You can use what is called a MiFi, though. They connect to cellular service and create a personal WiFi hotspot.

I just downloaded the latest OS upgrade and since I can not connect to the internet using my cellular data plan.

I just downloaded the latest iOS.7 upgrade on my ipad2, and since I can not connect to the internet using my cellular data plan. I have checked my data plan and it's both current and over 2GB remaining. However the indicator shows no service, thus would be the best steps to recover. Thanks much for any support that can be provided.

Hello Kmart2@3
Check out the troubleshooting article below to get cellular to start working again.
iPad (Wi-Fi + Cellular Models): Troubleshooting a cellular data connection
http://support.apple.com/kb/TS4249
Regards,
-Norm G.

Anyone have issues with their ipad staying connected to the Internet using an arris-5e12 router? I seem to be getting kicked off the Internet frequently

Anyone having trouble staying connected to the Internet using an Arris 5e12 router.?

Are you in an area where it doesn't pick much wifi signal up. If yes try to move your device nearer to the wifi connection box

Since downloading osx v10.7lion every time i try to connect to the internet using BT Broadband i keep getting a message saying " you cant openthe application ) because Power PC applications are no longer supported." this is very annoying as i likeBT ?????

Since downloading osx v10.7lion every time i try to connect to the internet using BT Broadband i keep getting a message saying
" you cant openthe application ) because Power PC applications are no longer supported." this is very annoying as i likeBT and the way it opens with all the local up to date news plus other apps +++
Please can anyone help me as apple will not help unless i sign up for a new product agreement which i cannot understand as every thing worked before this so called very latest software that everyone cant do without ?????

I had the same problem with some apps and printer setup software. SInce Rosetta has been discontinued on Lion my only solution was to restore to 10.6 since the manufacturers either have not yet or will not release updated apps. In this case you have to determine how important those old PPC apps are to keep around and if there alternitives that are available to replace the functionality. I would expect a broadband provider to update thier apps if it is something that is required to connect.
Mike

Why can't i connect to the internet using airport

I can't connect to the internet using Airport. I have to use a ethernet connection.

go to applications>utilities, and make sure your wireless is showing up in the left colum. If you see it there follow the promps to set it up

After a recent comcast / xfinity update I have been unable to even connect to the internet using firefox. I can using internet explorer.

After a recent comcast / xfinity update I have been unable to even connect to the internet using firefox. I can using internet explorer.

Take each of the following steps that you haven't already tried, until the problem is resolved.
Step 1
Restart the router. Many problems are solved that way.
Step 2
Change the name of the wireless network, if applicable, to eliminate any characters other than letters and digits. You do that on your router via its web page, if it's not an Apple device, or via AirPort Utility, if it is an Apple device.
Step 3
Run the Network Diagnostics assistant.
Step 4
Back up all data.
Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Keychain Access in the icon grid.
Enter the name of your wireless network in the search box. You should have one or more "AirPort network password" items with that name. Make a note of the name and password, then delete all the items. Quit Keychain Access. Turn Wi-Fi off and then back on. Reconnect to the network.
Step 5
You may need to change other settings on the router. See the guidelines linked below:
Recommended settings for Wi-Fi routers and access points
Potential sources of interference
Step 6
Make a note of all your settings for Wi-Fi in the Network preference pane, then delete the connection from the connection list and recreate it with the same settings. You do this by clicking the plus-sign icon below the connection list, and selecting Wi-Fi as the interface in the sheet that opens. Select Join other network from the Network Name menu, then select your network. Enter the password when prompted and save it in the keychain.
Step 7
Reset the System Management Controller (SMC).

Reader X wants to connect to the internet

Although I have choosen to update only manually, the Reader X always wants to connect to the internet. How may I stop him to do this?

OK, any illuminating messages in the logs?
/Applications/Utilities/Console.app
console.log
system.log
Mac OS X (10.4.4)

I want to connect to the internet using ethernet cable.

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