This blocked url happened in my laptop also. I didn’t thought of asking my query here, instead I take help of Click4Support company regarding this issue as I was completely clueless of the reason why this was happening. Their technicians explain the things to me that I should checked the LAN settings under tools to see if the proxy server is checked. If it was there then it means that I have a bug and Avast is doing its job on the computer. Then I have to restart my computer and tap F8 key till it asks about safe mode with networking. Then they asked me to download malwarebytes and run a full scan through it. Then I looked at the log to see that all the infections were removed. Next I run full scan with my antivirus for more safety.