To start with, you have a old version of avast installed.
I suggest you perform a clean installation of the latest version.
https://forum.avast.com/index.php?topic=169255.msg1203279#msg1203279

Blacklisted:
http://zulu.zscaler.com/submission/show/cf9b2636885b7b5a00fb3e7083bafec9-1429039522

Suspicion of Spam:
/> <link href="/temp…

Problems on that ASN:
http://urlquery.net/report.php?id=1429039874039
http://urlquery.net/report.php?id=1429039909690

Outdated software:
https://sitecheck.sucuri.net/results/dokuga.com

DNS problems:
http://dnscheck.pingdom.com/?domain=Dokuga.com

HUGE(!) security problems:
https://www.ssllabs.com/ssltest/analyze.html?d=dokuga.com

Pointing to blacklisted site:
http://quttera.com/detailed_report/Dokuga.com

If avast wasn’t blocking access to it, it wasn’t doing its job :wink:
Be glad that avast protected your system from malicious things.