ComboFix disconnects the computer from the Internet as part of its routine. If you did not disconnect, you may loose your connection. The connection is automatically restored before ComboFix completes its run. However, if ComboFix runs into difficulty and terminates prematurely, the connection can be restored by restarting your machine.
If rebooting did not restore your Internet connection, then follow these instructions for Manually restoring the Internet connection
: If you ran or want to run ComboFix just to see what it does or finds, please be aware that ComboFix was never meant to be used
as a general purpose malware scanner like SuperAntispyware or Malwarebytes' Anti-Malware which scan individual drives or different folders on a computer for viruses. If your machine is infected, also be aware that using it is only one part of the disinfection process. Preliminary scans from other tools like DDS
should be used first because they provide comprehensive logs with specific details about files, folders and registry keys which may have been modified by malware infection. Analysis of those logs allows planning an strategy for effective disinfection and a determination if using ComboFix is necessary. Please read the pinned topic ComboFix usage, Questions, Help? - Look here