So I installed TrendMicro TITANIUM Maximum Security 2012 on a system for a client, and the system no longer can use the Internet. Disabling the software has no effect. What could be the cause of the lack of internet?
This issue was caused by leftovers of the older software. I had to purge the remnants in the registry, as well as purge a couple of leftover softwares. That fixed it.
According to a CNET review, this security package "enhances" Windows firewall.
To check if a firewall is blocking your request or a host is simply not responding to your queries, type
You can also try a
Also check if the computer is still able to resolve hostnames, to do this use
Above are the first things I would check if internet connectivity were to fail on me.