Reinstalling or upgrading Skype can cause your firewall settings to become out of date. This can affect the quality of your audio calls.
If you are using Windows Firewall, follow the instructions below to update your firewall settings. If you are not using Windows Firewall, please ensure that exceptions are not allowed and that Skype does not appear in any list of exceptions for your firewall. Refer to the documentation for your firewall program if you are unsure how to do this.
Learn more about Skype and firewalls.
To update your Windows Firewall settings in Windows XP:
Ensure that Don’t allow exceptions is unticked.
If Skype is displayed in the Programs and Services list, highlight it and click Delete.
Sign in to Skype. When Windows Firewall asks you if you want to block Skype, click Unblock.
To update your Windows Firewall settings in Windows Vista and Windows 7:
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