From PETSc-3.15.x, we started to use scotch-v6.1.0.  We always take advantage of the "--download" capability to manage external packages for MOOSE. Recently, we hit something like this frequently:

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                            Trying to download git://https://gitlab.inria.fr/scotch/scotch.git for PTSCOTCH
                      =============================================================================================
                      =============================================================================================
                            Trying to download git://https://gitlab.inria.fr/scotch/scotch.git for PTSCOTCH
                      =============================================================================================
                      =============================================================================================
                            Trying to download git://https://gitlab.inria.fr/scotch/scotch.git for PTSCOTCH
                      =============================================================================================
                      =============================================================================================
                            Trying to download https://gitlab.inria.fr/scotch/scotch/-/archive/v6.1.0/scotch-v6.1.0.tar.gz for PTSCOTCH
                      =============================================================================================
                      =============================================================================================
                            Trying to download http://ftp.mcs.anl.gov/pub/petsc/externalpackages/scotch-v6.1.0.tar.gz for PTSCOTCH
                      =============================================================================================
                      =============================================================================================
                            Trying to download ftp://ftp.mcs.anl.gov/pub/petsc/externalpackages/scotch-v6.1.0.tar.gz for PTSCOTCH
                      =============================================================================================
                      =============================================================================================
                            Trying to download https://www.mcs.anl.gov/petsc/mirror/externalpackages/scotch-v6.1.0.tar.gz for PTSCOTCH
                      =============================================================================================
*******************************************************************************
         UNABLE to CONFIGURE with GIVEN OPTIONS    (see configure.log for details):
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I would not be surprised when we could not download PTSCOTCH from upstream websites in France.  But it seemed that we could not even download scotch from ANL mirrors either. I navigated through the ANL mirrors (https://www.mcs.anl.gov/petsc/mirror/externalpackages and ftp.mcs.anl.gov/pub/petsc/externalpackages). I found we did not have scotch-v6.1.0.tar.gz yet.

Could you please upload scotch-v6.1.0.tar.gz to mirror sites?