It is a DNS issue.
Try and change which net you are using. If you are on wifi at home try your cell, however if your home network and cell provider are the same that wont help.
A solution is to change which DNS you are using.
Its a bit nerdy but actually very easy. Do a search on "change which DNS you are using for browsing"
On your computer you can add following to your hosts file located in C:\Windows\System32\drivers\etc
add this
156.40.212.210 nih.gov
96.17.96.9 www.nih.gov
34.107.134.59 pubmed.ncbi.nlm.nih.gov
130.14.250.10 ftp.wip.ncbi.nlm.nih.gov
130.14.250.10 ftp.ncbi.nlm.nih.gov
130.14.29.110 blast.ncbi.nlm.nih.gov