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use MongoDB;
use Data::Dumper;
...
while ( my $c = $all_cfg->next ) {
  print Dumper $c;
}

MongoDB::AuthError: Authentication to //xxxxxxx:27017 failed: MongoDB:
+:AuthError: GSSAPI error: MongoDB::AuthError: Could not start GSSAPI.
+ Did you run kinit?  Error was: no mechanism available; SASL(-4): no 
+mechanism available: No worthy mechs found; client_start error. (Call
+backs?)