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?
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.
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.