My wireless internet was blocked by CISCO guest access

Question

My internet service was from AT&T and now it was changed to Timer Warner. But one problem appears every 1 or 2 months. After I click SAFARI, the menu shows:
CISCO GUEST ACCESS
Enter the guest access password to access the internet. Ask the owner if you
don't know the password. The Guest access password can be found using CISCO
connection.
My internet has no relationship with CISCO at all, why it appears? Usually it will last for several days then it will disappear. During the several days, I cannot use this Mac to access internet!
Does anyone know how to solve the problem? Thanks a lot.

Answer 1

Check the Wi-Fi menu to make sure you're connected to your own network, not someone else's. If you are, see below.
1. This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve the problem. But with the aid of the test results, the solution may take a few minutes, instead of hours or days.
Don't be put off by the complexity of these instructions. The process is much less complicated than the description. You do harder tasks with the computer all the time.
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. Backup is always a must, and when you're having any kind of trouble with the computer, you may be at higher than usual risk of losing data, whether you follow these instructions or not.
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. As I wrote above, it changes nothing. It doesn't send or receive any data on the network. All it does is to generate a human-readable report on the state of the computer. That report goes nowhere unless you choose to share it. If you prefer, you can act on it yourself without disclosing the contents to me or anyone else.
You should be wondering whether you can believe me, and whether it's safe to run a program at the behest of a stranger. In general, no, it's not safe and I don't encourage it.
In this case, however, there are a couple of ways for you to decide whether the program is safe without having to trust me. First, you can read it. Unlike an application that you download and click to run, it's transparent, so anyone with the necessary skill can verify what it does.
You may not be able to understand the script yourself. But variations of it have been posted on this website thousands of times over a period of years. The site is hosted by Apple, which does not allow it to be used to distribute harmful software. Any one of the millions of registered users could have read the script and raised the alarm if it was harmful. Then I would not be here now and you would not be reading this message. See, for example, this discussion.
Nevertheless, if you can't satisfy yourself that these instructions are safe, don't follow them. Ask for other options.
4. Here's a summary of what you need to do, if you choose to proceed:
☞ Copy a line of text in this window to the Clipboard.
☞ Paste into the window of another application.
☞ Wait for the test to run. It usually takes a few minutes.
☞ Paste the results, which will have been copied automatically, back into a reply on this page.
The sequence is: copy, paste, wait, paste again. You don't need to copy a second time. Details follow.
5. Try to test under conditions that reproduce the problem, as far as possible. For example, if the computer is sometimes, but not always, slow, run the test during a slowdown.
You may have started up in "safe" 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.
6. 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.
7. 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:/usr/libexec;clear;cd;p=(1222 ' 0.5 0.25 10 1000 15 5120 1000 25000 1 1 0 100 ' 51 25600 4 10 25 5120 102400 1000 25 1000 80 40 500 300 85 25 20480 262144 20 2000 524288 );k=({Soft,Hard}ware Memory Diagnostics Power FireWire Thunderbolt USB Bluetooth SerialATA Extensions Applications Frameworks PrefPane Fonts Displays CFBundleIdentifier 'tsA|[ST]M[HL]' PlistBuddy{,' 2>&1'}' -c Print' 'Info\.plist' 'com\\.apple\\.' -\\t N\\/A 'AES|atr|udit|msa|dnse|ax|ensh|fami|FileS|fing|ft[pw]|gedC|kdu|etS|is\.|alk|ODSA|otp|htt|pcas|ps-lp|rexe|rlo|rsh|smb|snm|teln|upd-[aw]|uuc|vix|webf' OSBundle{Require,AllowUserLoa}d );f=('\n%s'{': ','\n\n'}'%s\n' '\nRAM details\n%s\n' '%s %s\n' '%s\n'"${k[22]}"'%s\n' {Privacy,Mode}': %s\n' '\n   ...and %s more line(s)\n' 'RSSI: %s\nNoise: %s\nTx rate: %s\n' '\nContents of %s\n   '"${k[22]}"'mod date: %s\n   '"${k[22]}"'checksum: %s\n%s\n' '%d MB: %s\n' );b=(com.adobe.{AAM.Updater-1.0{,},AdobeCreativeCloud,CS{4,5}ServiceManager,fpsaud,SwitchBoard{,}} ${k[21]}{aelwriter,{AirPortBaseSt,SafariNotific}ationAgent,FolderActions.enabled,installer.osmessagetracing,mrt.uiagent,ReportCrash.Self,{rp,usb}muxd} com.citrixonline.GoToMeeting.G2MUpdate com.google.keystone.daemon{,} com.microsoft.office.licensing.helper com.oracle.java.{Helper-Tool,JavaUpdateHelper{,}} com.teamviewer.{Helper,teamviewer{,_desktop,_service}} org.macosforge.xquartz.{privileged_{,},}startx );c=(879294308 4071182229 461455494 3627668074 1083382502 1274181950 1855907737 2758863019 1848501757 464843899 2636415542 3694147963 1233118628 2456546649 2806998573 2778718105 842973933 2051385900 3301885676 891055588 998894468 695903914 1443423563 4136085286 3374894509 1051159591 892310726 1707497389 523110921 2883943871 3873345487 );s=(' s/[0-9A-Za-z._]+@[0-9A-Za-z.]+\.[0-9A-Za-z]{2,4}/EMAIL/g;/faceb/s/(at\.)[^.]+/\1NAME/g;/\/Shared/!s/(\/Users\/)[^ /]+/\1USER/g;s/[-0-9A-Fa-f]{22,}/UUID/g;' ' s/^ +//;/de: S|[nst]:/p;' ' {sub(/^ +/,"")};/er:/;/y:/&&$2<'${p[4]} ' s/:$//;3,6d;/[my].+:/d;s/^ {4}//;H;${ g;s/\n$//;/s: (E[^m]|[^EO])|x([^08]|02[^F]|8[^0])/p;} ' ' 5h;6{ H;g;/P/!p;} ' ' ($1~/^Cy/&&$3>'${p[9]}')||($1~/^Cond/&&$2!~/^N/) ' ' /:$/{ N;/:.+:/d;s/ *://;b0'$'\n'' };/^ *(V.+ [0N]|Man).+ /{ s/ 0x.... //;s/[()]//g;s/(.+: )(.+)/ (\2)/;H;};$b0'$'\n'' d;:0'$'\n'' x;s/\n\n//;/Apple[ ,]|Genesy|Intel|SMSC/d;s/\n.*//;/\)$/p;' ' s/^.*C/C/;H;${ g;/No th|pms/!p;} ' '/= [^GO]/p' '{$1=""};1' ' /Of/!{ s/^.+is |\.//g;p;} ' ' BEGIN { FS=":";if(system("sw_vers -productVersion|grep -q ^10\.1")) d="^'"${k[21]}"'launch(d\.peruser\.[0-9]+|ctl\.(Aqua|Background|System))$";} { if($2~/[1-9]/) { $2="status: "$2;printf("'"${f[4]}"'",$1,$2);} else if(!d||$1!~d) print $1;} ' ' { sub(/ :/,"");print|"tail -n'${p[10]}'";} ' ' NR==2&&$4<='${p[7]}' { print $4;} ' ' ($1~"wir"&&$2>'${p[22]}')||($1~"uts"&&$2>'${p[19]}') { print $1" "int($2);} ' '/YLD/s/=/ /p' ' { 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-q -x aggsortrev -n' profiles sed\ -En awk /S*/*/P*/*/*/C*/*/airport networksetup mdutil lsof test osascript\ -e netstat mdls route egrep 'dscl . -read' );c2=(${k[21]}loginwindow\ LoginHook ' /L*/P*/loginw*' "'tell app \"System Events\" to get properties of login items'" 'L*/Ca*/'${k[21]}'Saf*/E* -d 2 -name '${k[20]} '~ $TMPDIR.. \( -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 \)' -i '-nl -print' '-F \$Sender -k Level Nle 3 -k Facility Req "'${k[21]}'('{'bird|.*i?clou','lsu|sha'}')"' "-f'%N: %l' Desktop L*/Keyc*" therm sysload boot-args status " -F '\$Time \$Message' -k Sender kernel -k Message CRne '0xdc008012|calling|(complet|enabl)ed|ry HD' -k Message CReq 'bad |Can.t l|corru|dead|fail|GPU |hfs: Ru|inval|Limiti|v_c|NVDA\(|pagin|error|Refus|TCON|tim(ed? ?|ing )o|WARN' " '-du -n DEV -n EDEV 1 10' 'acrx -o%cpu,comm,ruid' "' syscall::recvfrom:return {@a[execname,uid]=sum(arg0)} syscall::sendto:return {@b[execname,uid]=sum(arg0)} syscall::open*:entry {@c[execname,uid,copyinstr(arg0),errno]=count()} syscall::execve:return, syscall::posix_spawn:return {@d[execname,uid,ppid]=count()} syscall::fork:return, syscall::vfork:return, syscall::posix_spawn:return /arg0 < 0/ {@e[execname,uid,arg0]=count()} syscall:::return /errno != 0/ {@f[execname,uid,errno]=count()} io:::wait-start {self->t=timestamp} io:::wait-done /self->t/ { this->T=timestamp - self->t;@g[execname,uid]=sum(this->T);self->t=0;} io:::start {@h[execname,uid]=sum(args[0]->b_bcount)} tick-10sec { normalize(@a,2560000);normalize(@b,2560000);normalize(@c,10);normalize(@d,10);normalize(@e,10);normalize(@f,10);normalize(@g,10000000);normalize(@h,10240);printa(\"1:%@d:%s:%d\n\",@a);printa(\"2:%@d:%s:%d\n\",@b);printa(\"9:%@d:%s:%d:%s:%d\n\",@c);printa(\"10:%@d:%s:%d:%d\n\",@d);printa(\"11:%@d:%s:%d:%d\n\",@e);printa(\"12:%@d:%s:%d:%d\n\",@f);printa(\"3:%@d:%s:%d\n\",@g);printa(\"4:%@d:%s:%d\n\",@h);exit(0);} '" '-f -pfc /var/db/r*/'${k[21]}'*.{BS,Bas,Es,J,OSXU,Rem,up}*.bom' '{/,}L*/Lo*/Diag* -type f -regex .\*[cght] ! -name .?\* ! -name \*ag \( -exec grep -lq "^Thread c" {} \; -exec printf \* \; -o -true \) -execdir stat -f:%Sc:%N -t%F {} \;' '/S*/*/Ca*/*xpc*' '-L /{S*/,}L*/StartupItems -type f -exec file {} +' kMDItemContentTypeTree=${k[21]}{bundle,mach-o-dylib} :Label "/p*/e*/{aut*,{cron,fs}tab,hosts,{[lp],sy}*.conf,mach_i*/*,pam.d/*,ssh{,d}_config,*.local} {/p*,/usr/local}/e*/periodic/*/* /L*/P*{,/*}/com.a*.{Bo,sec*.ap}*t {/S*/,/,}L*/{Lau,Sec}*/*t .launchd.conf" list '-F "" -k Sender hidd -k Nle 3' /Library/Preferences/${k[21]}alf\ globalstate --proxy '-n get default' -I --dns -get{dnsservers,info} -P -m\ / '' -n1 '-R -ce -l1 -n5 -o'{'prt -stats prt','mem -stats mem'}',command,uid' -kl -l -s\ / '--regexp --files '${k[21]}'pkg.*' '+c0 -i4TCP:0-1023' ${k[21]}dashboard\ layer-gadgets '-d /L*/Mana*/$USER' '-app Safari WebKitDNSPrefetchingEnabled' '-Fcu +c0 -l' -m 'L*/{Con*/*/Data/L*/,}Pref* -type f -size 0c -name *.plist.???????' kern.memorystatus_vm_pressure_level '3>&1 >&- 2>&3' '-F \$Message -k Sender kernel -k Message CReq "'{'n Cause: -','(a und|I/O |jnl_io.+)err','USBF:'}'"' -name\ kMDItem${k[16]} -T\ hfs '-n get default' -listnetworkserviceorder :${k[16]} :CFBundleDisplayName $EUID {,'/{S*/,}'}'L*/{,Co*/*/*/L*/}{Cache,Log}s $TMPDIR../C -type f -size +'${p[11]}'M -exec stat -f'%z:%N' {} \;' \ /v*/d*/*/*l*d{,.*.$UID}/* '-app Safari UserStyleSheetEnabled' "-o ',\"name\":\"[^\"]+' L*/A*/Fi*/P*/*/a*.json" users/$USER\ HomeDirectory '{/,}L*/{Con,Pref}* -type f ! -size 0 -name *.plist -exec plutil -s {} \;' ' -F "\$Time \$Sender \$(RefProc): \$Message" -k Level Nle 3 -k Facility R'{'ne "user|','eq "'}'console" -k Message CRne "sandbox ex" ' getenv );N1=${#c2[@]};for j in {0..15};do c2[N1+j]=SP${k[j]}DataType;done;l=({Restricted\ ,Lock,Pro}files POST Battery {Safari,App,{Bad,Loaded}\ kernel,Firefox}\ extensions System\ load boot\ args FileVault\ {2,1} {Kernel,System,Console}\ log Activity SMC Login\ hook 'I/O per process' 'High file counts' UID Daemons Agents XPC\ cache Startup\ items {Admin,Root}\ access Bundles Library\ paths{,' ('{shell,launchd}\)} Font\ issues Firewall Proxies DNS TCP/IP Wi-Fi 'Elapsed time (sec)' {Root,User}\ crontab {Global,User}' login items' Spotlight Memory\ pressure Listeners Widgets Parental\ Controls Prefetching Nets Volumes {Continuity,I/O,iCloud,HID,HCI}\ errors {User,System}\ {caches/logs,overrides} Shutdown\ codes Heat Diagnostic\ reports Bad\ plists Free\ space VM Stylesheet );N3=${#l[@]};for i in {0..8};do l[N3+i]=${k[5+i]};done;F() { local x="${s[$1]}";[[ "$x" =~ ^([\&\|\<\>]|$) ]]&&{ printf "$x";return;};:|${c1[30]} "$x" 2>&-;printf "%s \'%s\'" "|${c1[30+$?]}" "$x";};A0() { Q=6;v[2]=1;id -G|grep -qw 80;v[1]=$?;((v[1]))||{ Q=7;sudo -v;v[2]=$?;((v[2]))||Q=8;};v[3]=`date +%s`;date '+Start time: %T %D%n';printf '\n[Process started]\n\n'>&4;printf 'Revision: %s\n\n' ${p[0]};};A1() { local c="${c1[$1]} ${c2[$2]}";shift 2;c="$c ` while [[ "$1" ]];do F $1;shift;done`";((P2))&&{ c="sudo $c";P2=;};v=`eval "$c"`;[[ "$v" ]];};A2() { local c="${c1[$1]}";[[ "$c" =~ ^(awk|sed ) ]]&&c="$c '${s[$2]}'"||c="$c ${c2[$2]}";shift 2;local d=` while [[ "$1" ]];do F $1;shift;done`;((P2))&&{ c="sudo $c";P2=;};local a;v=` while read a;do eval "$c '$a' $d";done<<<"$v";`;[[ "$v" ]];};A3(){ v=$((`date +%s`-v[3]));};B1() { v=No;! ((v[1]))&&{ v=;P1=1;};};eval "`type -a B1|sed '1d;s/1/2/'`";B3(){ v[$1]="$v";};B4() { local i=$1;local j=$2;shift 2;local c="cat` while [[ "$1" ]];do F $1;shift;done`";v[j]=`eval "{ $c;}"<<<"${v[i]}"`;};B5(){ v[$1]="${v[$1]}"$'\n'"${v[$2]}";};B6() { v=` paste -d: <(printf "${v[$1]}") <(printf "${v[$2]}")|awk -F: ' {printf("'"${f[$3]}"'",$1,$2)} ' `;};B7(){ v=`egrep -v "${v[$1]}"<<<"$v"|sort`;};eval "`type -a B7|sed '1d;s/7/8/;s/-v //'`";C0() { [[ "$v" ]]&&sed -E "$s"<<<"$v";};C1() { [[ "$v" ]]&&printf "${f[$1]}" "${l[$2]}" "$v"|sed -E "$s";};C2() { v=`echo $v`;[[ "$v" != 0 ]]&&C1 0 $1;};C3() { B4 0 0 63&&C1 1 $1;};C4() { echo $'\t'"Part $((++P)) of $Q done at $((`date +%s`-v[3])) sec">&4;};C5() { sudo -k;pbcopy<<<"$o";printf '\n\tThe test results are on the Clipboard.\n\n\tPlease close this window.\n';exit 2>&-;};for i in 1 2;do eval D${i}0'(){ A'$i' $@;C0;};';for j in 2 3;do eval D$i$j'(){ local x=$1;shift;A'$i' $@;C'$j' $x;};';done;done;trap C5 2;o=$({ A0;D10 0 N1+1 2;D10 0 $N1 1;B1;C2 27;B1&&! B2&&C2 28;D12 22 15 63;D10 0 N1+2 3;D10 0 N1+15 17;D13 3 0 N1+3 4;D13 4 0 N1+4 5;D13 N3+4 0 N1+9 59;for i in 0 1 2;do D13 N3+i 0 N1+5+i 6;done;D13 N3+3 0 N1+8 71;D13 62 1 10 7;D13 10 1 11 8;B2&&D13 18 19 53 67;D12 11 2 12 9;D12 12 3 13 10;D12 13 42 70 101 25;D12 65 6 36 13;D12 45 20 52 66;D13 66 7 37 14;D13 17 8 15 38;D10 9 16 16 77 45;C4;B2&&D10 35 49 61 75 76 78 45;B2&&{ D10 28 17 45;C4;};D10 12 40 54 16 79 45;D10 12 39 54 16 80 45;D13 31 25 37 15&&{ B4 0 8 103;B4 8 0;A2 18 74;B6 8 0 3;C3 32;};B2&&D13 19 21 0;B2&&D13 40 10 42;B2&&D12 2 29 35 46;D12 44 34 43 53;D12 25 22 20 32;D12 33 0 N1+14 51;D12 34 21 28 35;D13 35 27 29 36;A1 40 59 81;B3 18;A1 33 60 82;B8 18;B4 0 19 83;A1 27 32 39&&{ B3 20;B4 19 0;A2 33 33 40;B3 21;B6 20 21 3;};C2 36;D13 50 38 5 68;B4 19 0;D23 37 33 34 42;B2&&D13 46 35 45 55;D13 38 32 31 43;B2&&D13 59 4 65 76 91;D13 63 4 19 44 75 95 96;B1&&{ D13 53 5 55 75 69&&D13 51 6 58 31;D13 56 5 56 97 75 98&&D10 0 N1+7 99;D12 55 5 27 84;D13 61 5 54 75 70;D13 14 5 14 12;D13 15 5 72 12;C4;};D13 16 5 73 12;A1 13 44 74 18;C4;B3 4;B4 4 0 85;A2 14 61 89;B4 0 5 19 102;A1 17 41 20;B7 5;C3 8;B4 4 0 88;A2 14 24 89;C4;B4 0 6 19 102;B4 4 0 86;A2 14 61 89;B4 0 7 19 102;B5 6 7;B4 6 6 73 102;B2&&{ A1 18 26 94;B7 6;B4 0 0 11;C3 23;};A1 18 26 94;B7 6;B4 0 0 11;C3 24;D13 60 14 66 92;D13 58 14 67 93;D13 26 4 21 24;D13 42 14 1 62;D13 43 37 2 90 48;D13 41 10 42;D12 48 36 47 25;A1 4 3 60&&{ B3 5;A2 14 61;B4 0 6 21;B4 5 0;A2 14 62;B4 0 0 21;B6 0 6 4;C3 5;};D13 9 41 69 100;D12 67 21 68 35;D12 49 21 48 49;B4 4 22 57 102;A1 21 46 56 74;B7 22;B4 0 0 58;C3 47;D13 54 5 7 75 76 69;D13 52 5 8 75 76 69;D13 57 4 64 76 91;D12 0 4 4 84;D12 1 4 51 84;D13 21 22 9 37;A1 23 18 28 89;B4 0 16 22 102;A1 16 25 33;B7 16;B4 0 0 34;D20 31 47;D13 64 4 71 41;C4;B4 4 12 26 89 23 102;for i in {0..3};do A1 0 N1+10+i 72 74;B7 12;B4 0 0 52;C3 N3+5+i;((i))||C4;done;A1 24 22 29;B7 12;B3 14;A2 39 57 30;B3 15;B6 14 15 4;C3 29;B4 4 13 27 89 65;A1 24 23;B7 13;C3 30;B4 4 0 87;A2 14 61 89 20;B4 0 16;A1 26 50 64;B7 16;C3 6;D13 7 11 6;A3;C2 39;C4;} 4>&2 2>/dev/null;);C5
Copy the selected text to the Clipboard by pressing the key combination command-C.
8. 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 and start typing the name.
Click anywhere in the Terminal window and paste by pressing command-V. The text you pasted should vanish immediately. If it doesn't, press the return key.
9. If you see an error message in the Terminal window such as "Syntax error" or "Event not found," enter
exec bash
and press return. Then paste the script again.
10. 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, 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.
11. 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, a series of lines will appear in the Terminal window like this:
[Process started]
        Part 1 of 8 done at … sec
        Part 8 of 8 done at … sec
        The results are on the Clipboard.
        Please close this window.
[Process completed]
The intervals between parts won't be exactly equal, but they give a rough indication of progress. The total number of parts may be different from what's shown here.
Wait for the final message "Process completed" to appear. If you don't see it within about ten minutes, the test probably won't complete in a reasonable time. In that case, press the key combination control-C or command-period to stop it. Then go to the next step.
12. When the test is complete, or if you stopped it because it was taking too long, 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.
At the top of the results, there will be a line that begins with the words "Start time." If you don't see that, but instead see a mass of gibberish, you didn't wait for the "Process completed" message to appear in the Terminal window. Please wait for it and try 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.
13. When you post the results, you might see an error message on the web page: "You have included content in your post that is not permitted," or "You are not authorized to post." That's a bug in the forum software. Please post the test results on Pastebin, then post a link here to the page you created.
14. 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 may not agree with them.
Copyright © 2014, 2015 by Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Use Agreement for 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.