ASX spokesperson Leanne Bland says the market is in "enquire mode" as the ASX investigates the issue.
She declined to give a timeframe for the normal return of trade but says it will keep people informed through its website.
"The market opened as normal this morning with about 6,700 trades, and minutes after opening this technical issue occurred and that's what we're investigating."
The S&P/ASX200 last traded at 4,242.2 points and the broader all ordinaries All Ordinaries at 4300.7 points.
The market closed higher yesterday after a sharp rebound.
After enquire mode, the market will go into "pre-noticed received phase" which allows traders to sort out orders. Trade will begin thereafter.
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