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ON I saw a comment

Server setup -> not programming -> belongs on – marc_s 27 secs ago

and tried to upvote the comment. I got the message

This comment is not eligible for voting or flagging.

What kind of comment is it?

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As an aside: I don't like such "belongs on" comments, at all... But they cannot be flagged either. – Arjan Dec 29 '10 at 17:29
up vote 4 down vote accepted

When a question is migrated, it is both closed and locked.

It is the latter state that restricts activity. See here for a description of what a locked post is, and what activities are allowed/disallowed on them.

For comparison, here is a closed question with comments, which can be voted on.

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