From the page we can not approve the scanning , there just no any prompt on page , and also while click on IPs table or sort by subnet Usage , page return empty.
在IP 地址页面中选中子网时，点击扫描时，页面有弹出启动扫描成功，但是子网扫面状态未变化（依然保持未扫描）
基于ID 4635981
Nmap 问题，请参照研发给出的回复内容处理。
Please follow the below steps to resolve the issue:
1. Go to the OpManager server --> OpManager home directory <Installation_Folder> --> Nmap folder --> IMPORTANT :: Remove all files and folders except Xml folder
2. Download the nmap 7.12.exe from below link.
3. IMPORTANT :: Install it under OpManager home directory<Installation_Folder>/Nmap/.
4. Restart the server.
5. Add the switches and subnet and then scan them.