I am using Stata/MC 16.1 on Windows 10 (also had the same problem using Ubuntu Linux 18.04).

I have been unable to install using the ssc command. Here is what I am seeing:

Code:
. ssc install sunflower
Code:
server reported server error
http://fmwww.bc.edu/repec/bocode/s/ either
1) is not a valid URL, or
2) could not be contacted, or
3) is not a Stata download site (has no stata.toc file).
r(675);
Also...
Code:
. ssc new
(contacting http://repec.org)
http://repec.org/docs/smcl.php could not be opened for read by copytextfile
r(601);


I am able to query for Stata updates and perform updates.

Code:
. update query
(contacting http://www.stata.com)

Update status
Last check for updates: 02 Mar 2020
New update available: none (as of 02 Mar 2020)
Current update level: 18 Feb 2020 (what's new)

Possible actions

Do nothing; all files are up to date.
I am seeing this problem on 3 computers in my office suite. I expect that I am seeing the fallout of some network [mis]configuration, but I don't have much to go on. Does this look familiar to anyone? Any ideas?