Error during command authentication.

Error - unable to initiate communication with LISTSERV (errno=111). The server is probably not started. In a message dated 9/8/2001 4:19:14 AM Pacific Daylight Time, [log in to unmask] writes:

What i meant to write was: if you can put an 'and' between the two
adjectives with no difference of meaning, you can put a comma. Otherwise,
you can't.

No such rule exists in American English (at least, I've never heard of it).  The only rule is that a comma must be placed between two successive adjectives, with a few exceptions (as with numbers, in "two successive", though it still feels right to put a comma in there, anyway, since there's a natural pause in speaking).