Johnny Mullins struck a late equaliser to salvage Rotherham a point at fellow play-off hopefuls Southend.
After a largely uneventful first period the game sprung into life when Kevan Hurst hit a stunning long-range strike to give the Shrimpers the lead.
The home side looked set for all three points until Millers captain Mullins bundled the ball home late on.
The draw leaves Rotherham occupying the final play-off spot with Southend six points back in eighth.
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Southend United manager Paul Sturrock told BBC Essex:
"I'm frustrated because I think we deserved more out of the game than we got.
"The first three main chances, apart from a header they had were from us. We've dominated most of the second half and been kicked in the teeth by a late goal. We didn't deserve that.
"It's something that's been playing on us for about a month now, where we finish up looking the better side, having opportunities and not taking them.
"It's a frustrating time for this football club because we believe we should be winning football games, but we're not."
Rotherham manager Steve Evans told BBC Radio Sheffield:
"I thought today we were simply outstanding. In the first half we were the dominant side.
"We opened them up time and time again, but we could have executed those situations better.
"We were just starting to get back on top in the second half and then it's a wonder strike from the young man (Kevan Hurst).
"But we never stopped, made some positive changes and those changes got us back in the game."