Looks like the manual didn't get generated correctly for petsc-3.11.1. For now - I've restored the 3.11 manual - so the URL should work now.
Satish On Mon, 15 Apr 2019, Xiang Huang via petsc-users wrote: > http://www.mcs.anl.gov/petsc/petsc-current/docs/manual.pdf > > Error 404 > The web server cannot find the file for which you are looking. > > Best, > Xiang >