Problems with make fetchindex on FreeBSD-10

[Montgomery-Smith, Stephen]

I get this error message if I do "make fetchindex" on FreeBSD-10.

Certificate verification failed for /C=US/O=Let's Encrypt/CN=Let's 
Encrypt Authority X3
675258712:error:14090086:SSL 
routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify 
failed:/usr/src/secure/lib/libssl/../../../crypto/openssl/ssl/s3_clnt.c:1191:
fetch: https://www.FreeBSD.org/ports/INDEX-10.bz2: Authentication error

Is this an error at my end or yours?  I have been successfully doing 
"make fetchindex" for many years from this same computer.

Thanks, Stephen