I think I've been infected with a virus and my other anti-virus program isn't catching it; how do I turn on Firefox's virus protection?

For the past few months, I've had this very weird problem. Any time I'm online, what looks like a big cursor (as if I'm in a writing program or typing in a text field) will appear in random places on any webpage. The cursor flashes, can be different sizes, and comes and goes randomly. Sometimes it's almost three-quarters the height of the webpage; sometimes it's small. I mentioned it to a computer-savvy friend who suggested that the computer might be infected with a virus. I have Avira, but apparently it's not catching this virus, if that's what it is. How do I know whether Firefox's anti-virus program is enabled, and do you think it can solve my "cursor" issue?? Help!

You may have switched on [http://kb.mozillazine.org/accessibility.browsewithcaret caret browsing]: press F7 to toggle
See http://kb.mozillazine.org/Scrolling_with_arrow_keys_no_longer_works
Tools > Options > Advanced : General: Accessibility: [ ] "Always use the cursor keys to navigate within pages"
See also http://kb.mozillazine.org/Accessibility_features_of_Firefox

Similar Messages

How do I know if my Mac has been infected with the virus

I recently was asked to download an Adobe Acrobat reader update but before I was made aware that the current virus was contained in a similar request, I downloaded what I assumed to be a legit update. I currently do not use my mail program on my Mac so am unaware of any spam being distributed from the computer. How can I identify if my computer has been infected with this Trojan Horse virus?

Two Helpful Links Regarding Flashback Trojan
A link to a great User Tip about the trojan: Flashback Trojan User Tip
A related link in the tip to a checker: Malware Checker Dowload Link
A Google search can reveal a variety of alternatives on how the remove the trojan should your computer get infected. This can get you started.
For now I recommend the User Tip from etressoft to detect and remove:
Checking for and removing the "Flashback" trojan

My Mac Book Pro says it has been infected with viruses. How do I clean them up?

My Macbook Pro says it has been infected with viruses. How do I clean it up?

There are different variants of names for this malware but the steps of removal should be the same unless it has advanced.
http://www.securemac.com/MAC-Defender-Rouge-Anti-Virus-Analysis-Removal.php
https://discussions.apple.com/thread/3032201?start=0&tstart=0
https://discussions.apple.com/thread/3042885?start=0&tstart=0
http://www.reedcorner.net/news.php/news.php?s=macdefender

HT5228 How can I tell if my computer has been infected with the Trojan?

How can I tell if my computer has been infected with this latest Trojan (or with any Trojan)? I did install the latest update to Java when I was told by my iMac that new software was available for my computer, which was just 2 or 3 days ago (first week of April). Now it is being said that there was a Java Trojan.
Many thanks for any replies!

Log out and log back in, if you haven’t done so recently. Launch the 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.
☞ If you’re running Mac OS X 10.7 or later, open LaunchPad. Click Utilities, then Terminal in the page that opens.
Step 1
Copy or drag — do not type — the line below into the Terminal window, then press return:
launchctl getenv DYLD_INSERT_LIBRARIES
Post the lines of output, if any, that appear below what you just entered (the text, please, not a screenshot.)
Step 2
Repeat with this line (triple-click anywhere in it to select the whole line):
find /Applications /System/Library/CoreServices -type d -name *.app -exec defaults read {}/Contents/Info LSEnvironment \; 2> /dev/null | grep DYLD_INSERT_LIBRARIES
The command will take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear.
If you get no output from either step, you're not infected with any variant of Flashback that I know of.

We have been blocked from Facebook with a message that says we have been infected with malware on our iPad 2, what can we do?

We have been blocked from Facebook with a message that says we have been infected with malware on our iPad 2, what can we do?

You don't have malware on your iPad. Report the issue to FaceBook: http://www.facebook.com/help/

Is this a genuine error message 'ipad has been infected with potential virus'

II was just about to watch a film through my iPad and a new screen opened 'phone updating.com' and the message read 'Virus warning, ipad has been infected with potential virus. Click the ok button to scan your iPhone now.'
I didn't press ok and it wouldn't let me cross out so I checked and updated to the latest version (8.2) and when my ipad restarted, safari opened it on the same error page. I then went to settings and cleared my Safari history which thankfully clearly the page.
My concern now is what if I have something bad (virus?) on my iPad? Or im hoping that because I didn't click okay that all is okay again.
can anyone advise if they have come across anything similar or if I need to do something else?
MAny Thanks

Thanks, that's what I thought. Do you know if there was any other way that I could have cleared the message other than by clearing my safari history, and more importantly, as I didn't click okay, would this have stopped anything else happening to my ipad?

I have an IMac and opened an email that may have been infected with a virus. How do I check my IMac for a possible virus?

I have an IMac and opened an email that may have been infected with a virus. How do I check my IMac for a possible virus? What does PPC mean?

You would be better posting this in the Lion forum.
https://discussions.apple.com/community/mac_os/mac_os_x_v10.7_lion?view=discussi ons
It's possible you email contained a virus, but unlikely. There haven't been any reports of email viruses effecting the mac.
My understanding is the Apple provides security updates for all malware including viruses.
There have been reports of a --
-- Phoney virus checking program
-- flash malware.
ppc -- Power PC. An older computer processor used by Apple. Last Mac shipped with PPC was in 2006.
I've read about two virus checking programs for the mac. One is clamav. The rest are either junk or malware.
http://www.clamav.net/lang/en/
Security update.
http://support.apple.com/kb/HT1222

Does anypne know how to fix the missing MSCVR80.dll file? Ive reinstalled itunes several timessysystem restores. Ive tried everything I can think of . Been sitting here all day and nightHELP!!!!!!!!!!!!!!!!!!!

Does anypne know how to fix the missing MSCVR80.dll file? Ive reinstalled itunes several timessysystem restores. Ive tried everything I can think of . Been sitting here all day and nightHELP!!!!!!!!!!!!!!!!!!!

Go to Control Panel > Add or Remove Programs (Win XP) or Programs and Features (later)
Remove all of these items in the following order:
iTunes
Apple Software Update
Apple Mobile Device Support (if this won't uninstall move on to the next item)
Bonjour
Apple Application Support
Reboot, download iTunes, then reinstall, either using an account with administrative rights, or right-clicking the downloaded installer and selecting Run as Administrator.
The uninstall and reinstall process will preserve your iTunes library and settings, but ideally you would back up the library and your other important personal documents and data on a regular basis. See this user tip for a suggested technique.
Please note:
Some users may need to follow all the steps in whichever of the following support documents applies to their system. These include some additional manual file and folder deletions not mentioned above.
HT1925: Removing and Reinstalling iTunes for Windows XP
HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
tt2

I have macbook pro and am on OS X Yosemite 10.10.2 . I am having lot of warning message on my browser that my computer is infected with malware/spyware and use mackeeper. How do I solve this issue . This is happening more on chrome and Safari browser

I have macbook pro and am on OS X Yosemite 10.10.2 . I am having lot of warning message on my browser that my computer is infected with malware/spyware and use mackeeper. How do I solve this issue . This is happening more on chrome and Safari browser

There is no need to download anything to solve this problem. You may have installed a variant of the "VSearch" ad-injection malware. Follow Apple Support's instructions to remove it.
If you have trouble following those instructions, see below.
Malware is always changing to get around the defenses against it. This procedure works as of now, as far as I know. It may not work in the future. Anyone finding this comment a few days or more after it was posted should look for a more recent discussion, or start a new one.
The VSearch malware tries to hide itself by varying the names of the files it installs. To remove it, you must first identify the naming pattern.
Triple-click the line below on this page to select it, then copy the text to the Clipboard by pressing the key combination command-C:
/Library/LaunchDaemons
In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.
A folder named "LaunchDaemons" may open. Look inside it for two files with names of the form
          com.something.daemon.plist
and
           com.something.helper.plist
Here something is a variable string of characters, which can be different in each case. So far it has always been a string of letters without punctuation, such as "cloud," "dot," "highway," "submarine," or "trusteddownloads." Sometimes it's a meaningless string such as "e8dec5ae7fc75c28" rather than a word. Sometimes the string is "apple," and then you must be especially careful not to delete the wrong files, because many built-in OS X files have similar names.
If you find these files, leave the LaunchDaemons folder open, and open the following folder in the same way:
/Library/LaunchAgents
In this folder, there may be a file named
          com.something.agent.plist
where the string something is the same as before.
If you feel confident that you've identified the above files, back up all data, then drag just those three files—nothing else—to the Trash. You may be prompted for your administrator login password. Close the Finder windows and restart the computer.
Don't delete the "LaunchAgents" or "LaunchDaemons" folder or anything else inside either one.
The malware is now permanently inactivated, as long as you never reinstall it. You can stop here if you like, or you can remove two remaining components for the sake of completeness.
Open this folder:
/Library/Application Support
If it has a subfolder named just
           something
where something is the same string you saw before, drag that subfolder to the Trash and close the window.
Don't delete the "Application Support" folder or anything else inside it.
Finally, in this folder:
/System/Library/Frameworks
there may an item named exactly
            v.framework
It's actually a folder, though it has a different icon than usual. This item always has the above name; it doesn't vary. Drag it to the Trash and close the window.
Don't delete the "Frameworks" folder or anything else inside it.
If you didn't find the files or you're not sure about the identification, post what you found.
If in doubt, or if you have no backups, change nothing at all.
The trouble may have started when you downloaded and ran an application called "MPlayerX." That's the name of a legitimate free movie player, but the name is also used fraudulently to distribute VSearch. If there is an item with that name in the Applications folder, delete it, and if you wish, replace it with the genuine article from mplayerx.org.
This trojan is often found on illegal websites that traffic in pirated content such as movies. If you, or anyone else who uses the computer, visit such sites and follow prompts to install software, you can expect more of the same, and worse, to follow. Never install any software that you downloaded from a bittorrent, or that was downloaded by someone else from an unknown source.
In the Security & Privacy pane of System Preferences, select the General tab. The radio button marked Anywhere should not be selected. If it is, click the lock icon to unlock the settings, then select one of the other buttons. After that, don't ignore a warning that you are about to run or install an application from an unknown developer.
Then, still in System Preferences, open the App Store or Software Update pane and check the box marked
          Install system data files and security updates (OS X 10.10 or later)
or
          Download updates automatically (OS X 10.9 or earlier)
if it's not already checked.

Since downloading Yosmite on my MAC I have not been able to download photos to LR 5. Error message: "the following files were not imported because they could not be read (335).I have been working with several forums and have dtried going into preference

LR 5 - using it on a MAC-
Error message: "the following files were not imported because they could not be read (335).
I have been working with several forums and have tried all recommendations and none have worked.
I have tried reloading new LR 5 - and it worked for a short time and then stopped.
Very frustrated that I cannot talk with someone at Adobe.
The folks that have made recommendations are great but once their suggestions dont work they drop the link,
Is there someone or someplace I can take my computer to fix this issue.
It seems to be a problem between LR and Yosemite.

The permissions have been changed on the destination folder where the photos are to be copied into.
You must make sure that the permissions are set to Read and Write.
Or perhaps the destination folder has been changed accidentally to something else, and you need to change it back to whatever it used to be.

I've lost my iphone with passcode lock and find my iphone lock on but the wifi n cellular data was turned off so no way i can trace it so the only question remains is will the person who finds it be able to unlock it and use it as his own ?

i've lost my iphone with passcode lock and find my iphone lock on but the wifi n cellular data was turned off so no way i can trace it so the only question remains is will the person who finds it be able to unlock it and use it as his own ?
is it possible to change imei number?
i've tried for so many times n still the phone is offline so i've set it to offline mode with my message but it never shows the last location why?

If the device is found, nobody can use it without knowing your Apple ID and password.
The phone will only show it's location if it is connected to cellular network or Wi-Fi. If those options are switched off, you can't locate the phone.
With iOS 7, Find My iPhone includes a new feature called Activation Lock, which is designed to prevent anyone else from using your iPhone, iPad, or iPod touch if you ever lose it. It starts working the moment you turn on Find My iPhone in iOS 7. With Activation Lock, your Apple ID and password will be required before anyone can:
Turn off Find My iPhone on your device
Erase your device
Reactivate and use your device
This can help you keep your device secure, even if it is in the wrong hands, and can improve your chances of recovering it. Even if you erase your device remotely, Activation Lock can continue to deter anyone from reactivating your device without your permission. All you need to do is keep Find My iPhone turned on, andremember your Apple ID and password.
What steps should I take if I misplace my device?
If you ever misplace your device—whether it’s just lost or you think it may have been stolen—you should put it into Lost Mode immediately using Find My iPhone.
Lost Mode locks your screen with a four-digit passcode and lets you display a custom message with your phone number to help you get it back. You can also remotely erase your device if needed, and your custom message will continue to display even after the device is erased.
While Activation Lock works in the background to make it more difficult for someone to use or sell your missing device, Lost Mode clearly indicates to anyone who finds your device that it still belongs to you and can’t be reactivated without your password.
To put a device into Lost Mode, sign in to icloud.com/find from a Mac or PC or use the Find My iPhone iOS app.
For more information, read what to do if your device is lost or stolen.
copied from iCloud: Find My iPhone Activation Lock in iOS 7

I have a MacBook Pro 15" and my warranty just ran out! I partitioned my harddrive into two partitions, one with Snow Leopard and the other with microsoft.This morning I turned on my Macbook Pro and it will not boot into Snow Leopard.

Good Morning,
I have a MacBook Pro 15" and my warranty just ran out! I partitioned my harddrive into two partitions, one with Snow Leopard and the other with microsoft.This morning I turned on my Macbook Pro and it will not boot into Snow Leopard. I shut it off took out the battery, reinstalled the battery. Then I put in the Snow Leopard CD and booted up to disk utility and The Snow Leopard partion would not show up?? I do see the microsoft partion.
I also rebooted holding down the shift key and still no Snow Leopard
Could you please tell me what I can do, what keys do I press on restart any advice to get Snow leopard back.
thank you.

Have you restarted holding down the Opt key? That procedure should give you a gray screen with all of the partitions that exist. Then select the SL partition for boot. Also go to System Preferences and Startup Disk, unlock the lock and select the SL partition as the default boot partition, then relock.

ı have 2 account one gamecenter with single emaill and password.it is like a identical twins of different.how can ı make it single?

ı have 2 account one gamecenter with single emaill and password.it is like a identical twins of different.how can ı make it single?

Are you referring to 2 iTunes accounts/Apple ID's? If so you can't, all purchases are tied to each Apple ID so if you need to say reload an app or update, it would be with that account.

Why is my Snow Leopard 10.6.8 suddenly giving me a gray screen and progress bar after I've turned it on? The progress bar takes 4-5 minutes to complete then signing on with my password and all other operations are normal. Solution? Many thanks.

Why is my Snow Leopard 10.6.8 suddenly giving me a gray screen and progress bar after I've turned it on? The progress bar takes 4-5 minutes to complete then signing on with my password and all other operations are normal. Solution? Many thanks.

It's starting in safe mode > http://support.apple.com/kb/HT1564
First of all, do a PRAM reset. If it doesn't help, open Terminal and type:
sudo nvram boot-args=""

Ichat video works with some people and not others

Can someone help me? I can video Ichat with some people and not others. HOwever, if the people I can video ichat with put me in a three way chat with someone I can't Icaht video with, it works. Here is the first half of the error I get when I try to call someone with whom it doesn't work:
Date/Time: 2008-05-08 20:59:35.554 -0400
OS Version: 10.5.2 (Build 9C7010)
Report Version: 4
iChat Connection Log:
2008-05-08 20:59:21 -0400: AVChat started with ID 2203145046.
2008-05-08 20:59:21 -0400: scddean8: State change from AVChatNoState to AVChatStateWaiting.
2008-05-08 20:59:21 -0400: 0x1946a450: State change from AVChatNoState to AVChatStateInvited.
2008-05-08 20:59:24 -0400: 0x1946a450: State change from AVChatStateInvited to AVChatStateConnecting.
2008-05-08 20:59:24 -0400: scddean8: State change from AVChatStateWaiting to AVChatStateConnecting.
2008-05-08 20:59:32 -0400: 0x1946a450: State change from AVChatStateConnecting to AVChatStateEnded.
2008-05-08 20:59:32 -0400: 0x1946a450: Error -7 (0x1946a450 cancelled the connection.)
2008-05-08 20:59:32 -0400: scddean8: State change from AVChatStateConnecting to AVChatStateEnded.
2008-05-08 20:59:32 -0400: scddean8: Error -7 (0x1946a450 cancelled the connection.)
Video Conference Error Report:
950.806728 @SIP/SIP.c:2719 type=4 (900A002D/0)
[SIPConnectIPPort failed]
Video Conference Support Report:
0.000000 @SIP/Transport.c:2362 type=1 (00000000/0)
[SIP/2.0 200 OK
Via: SIP/2.0/UDP 24.9.170.64:16402;branch=z9hG4bK253ca464241b86c5
To: 0 <sip:user@lip:16402>;tag=1748993363
From: u0 <sip:user@lip:16402>;tag=242696585
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 1 INVITE
Contact: <sip:[email protected]:16402>
User-Agent: Viceroy 1.3
Content-Type: application/sdp
Content-Length: 443
v=0
o=SDEAN 0 0 IN IP4 68.109.25.62
s=skiier526121
c=IN IP4 68.109.25.62
b=AS:2147483647
t=0 0
a=hwi:17412:2:2400
a=bandwidthDetection:YES
a=iChatEncryption:NO
m=audio 16402 RTP/AVP 110
a=rtcp:16402
a=rtpmap:110 X-AAC_LD/22050
a=rtpID:163897054
m=video 16402 RTP/AVP 126
a=rtcp:16402
a=rtpmap:126 X-H264/90000
a=RTCP:AUDIO 16402 VIDEO 16402
a=fmtp:126 imagesize 0 rules 20:160:120:320:240
a=framerate:20
a=rtpID:4247390608
0.130320 @SIP/Transport.c:347 type=2 (00000000/0)
[ACK sip:user@lip:16402 SIP/2.0
Via: SIP/2.0/UDP 24.9.170.64:16402;branch=z9hG4bK758f935e51030677
Max-Forwards: 70
To: 0 <sip:user@lip:16402>;tag=1748993363
From: u0 <sip:user@lip:16402>;tag=242696585
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 1 ACK
User-Agent: Viceroy 1.3
Content-Length: 0
0.131540 @SIP/Transport.c:2362 type=1 (00000000/0)
[SUBSCRIBE sip:user@lip:16402 SIP/2.0
Via: SIP/2.0/UDP 68.109.25.62:16402;branch=z9hG4bK3c1d470911bfc4fc
Max-Forwards: 70
To: u0 <sip:user@lip:16402>;tag=242696585
From: 0 <sip:user@lip:16402>;tag=1748993363
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 1 SUBSCRIBE
Contact: <sip:[email protected]:16402>
Event: conference
Expires: 3600
User-Agent: Viceroy 1.3
Content-Length: 0
0.258925 @SIP/Transport.c:347 type=2 (00000000/0)
[SIP/2.0 200 OK
Via: SIP/2.0/UDP 68.109.25.62:16402;branch=z9hG4bK3c1d470911bfc4fc
To: u0 <sip:user@lip:16402>;tag=242696585
From: 0 <sip:user@lip:16402>;tag=1748993363
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 1 SUBSCRIBE
Contact: <sip:[email protected]:16402>;isfocus
Expires: 3600
User-Agent: Viceroy 1.3
Content-Length: 0
0.266139 @SIP/Transport.c:347 type=2 (00000000/0)
[NOTIFY sip:user@lip:16402 SIP/2.0
Via: SIP/2.0/UDP 24.9.170.64:16402;branch=z9hG4bK07f3cf2d27e5dc4f
Max-Forwards: 70
To: 0 <sip:user@lip:16402>;tag=1748993363
From: u0 <sip:user@lip:16402>;tag=242696585
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 2 NOTIFY
Contact: <sip:[email protected]:16402>;isfocus
Event: conference
Subscription-State: active;expires=3600
User-Agent: Viceroy 1.3
Content-Type: application/conference-info+xml
Content-Length: 0
[<c-i v="0" st="f" en="sip:user@lip:16402">
c<h>i</h><m t="a"/><m t="v"/>
c<h>o</h><m t="a"/><m t="v"/>
c<h>o</h><m t="a"/><m t="v"/>
</c-i>
0.267647 @SIP/Transport.c:2362 type=1 (00000000/0)
[SIP/2.0 200 OK
Via: SIP/2.0/UDP 24.9.170.64:16402;branch=z9hG4bK07f3cf2d27e5dc4f
To: 0 <sip:user@lip:16402>;tag=1748993363
From: u0 <sip:user@lip:16402>;tag=242696585
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 2 NOTIFY
User-Agent: Viceroy 1.3
Content-Length: 0
0.489410 @:0 type=1 (00000000/0)
[Bandwidth Detection]
[Received the first BWD packet from 24.9.170.64:16402]
0.809558 @:0 type=1 (00000000/0)
[Bandwidth Detection]
[Avg=98115.00, NSDev=6.54%]
1.049428 @:0 type=1 (00000000/1)
[Bandwidth Detection]
[Avg=1063830.90, NSDev=55.48%]
1.396681 @:0 type=1 (00000000/2)
[Bandwidth Detection]
[Avg=1218589.60, NSDev=19.06%]
1.555003 @SIP/Transport.c:347 type=2 (00000000/0)
[MESSAGE sip:user@lip:16402 SIP/2.0
Via: SIP/2.0/UDP 24.9.170.64:16402;branch=z9hG4bK7a3f72b46979010e
Max-Forwards: 70
To: 0 <sip:user@lip:16402>;tag=1748993363
From: u0 <sip:user@lip:16402>;tag=242696585
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 3 MESSAGE
User-Agent: Viceroy 1.3
Content-Type: text/plain
Content-Length: 8
[SECUPD:0]
1.555264 @SIP/Transport.c:2362 type=1 (00000000/0)
[SIP/2.0 200 OK
Via: SIP/2.0/UDP 24.9.170.64:16402;branch=z9hG4bK7a3f72b46979010e
To: 0 <sip:user@lip:16402>;tag=1748993363
From: u0 <sip:user@lip:16402>;tag=242696585
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 3 MESSAGE
User-Agent: Viceroy 1.3
Content-Length: 0
22.411383 @SIP/Transport.c:2362 type=1 (00000000/0)
[MESSAGE sip:user@lip:16402 SIP/2.0
Via: SIP/2.0/UDP 68.109.25.62:16402;branch=z9hG4bK225017670f058825
Max-Forwards: 70
To: u0 <sip:user@lip:16402>;tag=242696585
From: 0 <sip:user@lip:16402>;tag=1748993363
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 2 MESSAGE
User-Agent: Viceroy 1.3
Content-Type: text/plain
Content-Length: 4
PING]
22.552977 @SIP/Transport.c:347 type=2 (00000000/0)
[SIP/2.0 200 OK
Via: SIP/2.0/UDP 68.109.25.62:16402;branch=z9hG4bK225017670f058825
To: u0 <sip:user@lip:16402>;tag=242696585
From: 0 <sip:user@lip:16402>;tag=1748993363
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 2 MESSAGE
User-Agent: Viceroy 1.3
Content-Length: 0
23.667085 @SIP/Transport.c:347 type=2 (00000000/0)
[MESSAGE sip:user@lip:16402 SIP/2.0
Via: SIP/2.0/UDP 24.9.170.64:16402;branch=z9hG4bK0d3ce7637235b638
Max-Forwards: 70
To: 0 <sip:user@lip:16402>;tag=1748993363
From: u0 <sip:user@lip:16402>;tag=242696585
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 4 MESSAGE
User-Agent: Viceroy 1.3
Content-Type: text/plain
Content-Length: 4
[PING]
23.667857 @SIP/Transport.c:2362 type=1 (00000000/0)
[SIP/2.0 200 OK
Via: SIP/2.0/UDP 24.9.170.64:16402;branch=z9hG4bK0d3ce7637235b638
To: 0 <sip:user@lip:16402>;tag=1748993363
From: u0 <sip:user@lip:16402>;tag=242696585
Call-ID: f7d46dbe-1d60-11dd-9664-c634114a4012@lip
CSeq: 4 MESSAGE
User-Agent: Viceroy 1.3
Content-Length: 0

I found the following comment the other day that goes some way to explaining why iChat might have problems with some NAT routers:
http://www.technologyevangelist.com/2007/02/ichatav_the_bestun.html#comment-53326
While it doesn't offer any solutions it might be worth firing off some iChat feedback to Apple referencing it. It seems like it might be a trivial bug for Apple to fix and could well alleviate many of the problems people are having.
In the mean time if your router is one that has SIP ALG you could try disabling it and forwarding all relevant ports to your machine.

I think I've been infected with a virus and my other anti-virus program isn't catching it; how do I turn on Firefox's virus protection?

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