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When I try to download any file with IDM, it just tries to connect to the Internet and cannot start downloading, or shows some error message
Reason. IDM is not allowed to download or run in Firewall settings. Many FireWalls check the size of application executable file that try to access the Internet. That's because a virus can replace the file with its own, and get access to the Internet. Probably when you updated IDM, its executable file size changed, and your FireWall blocked the Internet access for IDM. If you have a FireWall installed, please check that IDM has appropriate access rights.

Solution. Change incorrect Firewall settings. Please choose instructions for your Internet Security (Firewall) software below:

AhnLab V3 Internet Security 8.0 Avast Internet Security
AVG Internet Security Avira Internet Security
Bitdefender Internet Security 2013 COMODO Internet Security
Dr. Web ESET Smart Security
Kaspersky Internet Security 2013 McAfee Total Protection
Net-Peeker Norman Security Suite
Norton Internet Security Outpost Security Suite Pro
Panda Global Protection 2013 PC Tools ThreatFire
Windows Firewall ZoneAlarm Security

If the instructions above do not help, please try to completely uninstall your FireWall TEMPORARILY. Disabling the firewall is not enough, because FireWall keeps blocking access even if you switch it off. After uninstalling and rebooting, check if your problem persists. If it is resolved, then the problem is definitely caused by your FireWall software. You should try to contact its developers, and ask them for a solution, or try another FireWall.