The site had a malware infection few months ago (favicon.ico). Now it clean, but avast still blocks the site. Can you exclude the site from avast’s blacklist?
The site is http://advecs-zagr.ru
VirusTotal 0/36
https://www.virustotal.com/ru/url/de9e3df0892d57634a77167c302127c06f177cbaca508292d4ff8228cea80ce2/analysis/