signature

% sudo port install db60
--->  Fetching archive for db60
Warning: Your DNS servers incorrectly claim to know the address of nonexistent hosts. This may cause checksum mismatches for some ports. See this page for more information: <https://trac.macports.org/wiki/MisbehavingServers>
--->  Attempting to fetch db60-6.0.30_2+sql.darwin_16.x86_64.tbz2 from https://packages.macports.org/db60
--->  Attempting to fetch db60-6.0.30_2+sql.darwin_16.x86_64.tbz2.rmd160 from https://packages.macports.org/db60
Warning: Failed to verify signature for archive!
Error: Failed to archivefetch db60: version @6.0.30_2+sql
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_databases_db60/db60/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.