I have configured UNC based web farm for IIS 7.5 sites on multiple server for one of major project and cross checked by browsing on each server. As the first page of site is .html file website god browsed and when tried to browse .aspx page got below error
Tried below option to resolve the issue
Dropped and re-created App Pool ( as in some cases it works ) but in this scenario it didn’t worked so checked app pool running in which identity and authentication for website it was running under NETWORK SERVICE
So tried by giving permissions to NETWORK SERVICE to Shared folder permissions and the website started working and problem gor resolved.