I posted this issue with a false positive report, but it hadn’t fix and I didn’t get any response.
That is why I write the thread.
My non-public server has began to be detected as a threat by Avast Web Shield.
it is just my private server for studying. i dont know why it recognizes a malicious url.
I already had checked my web site source code several times, but I couldn’t find any problem.
Even I also checked online malware scanners but they said that my server is clean.
Can anyone explain to me about this issue?
IP : 1.234.91.194 (S.Korea)
Domain : iz.izuny.net
In addition, my server has been hosted by the korean vps service provider which called CAFE24.
https://www.virustotal.com/ko/url/9b5bb21ee8023401a19d930960c3a15a4cf9c43571ba52a4a886686873e1ec85/analysis/1424614397/
http://zulu.zscaler.com/submission/show/8c5c6867bfb62fa93c73957f87ddf5c9-1424614441
http://www.urlvoid.com/scan/iz.izuny.net/
I should turn off the protection when i connect to my server onerously because of this issue. 
i am using the avast internet security 2015 150222-1. thanks.