The protesters twice broke through the barrier the Iraqis and Syrians have formed, only to be pushed back by Greek riot police who used only their shields.
People speaking for the Iraqis and Syrians, including Kurds from both countries, have told police that they are not taking part in today's protest and that the protesters are from Afghanistan and Pakistan.
"There were people, whom we do not know, telling us that they would help us open the border at noon today, but obviously this was not true," Syrian refugee Hassan Fatuhlla told The Associated Press.
Iraqis and Syrians are allowed into the European Union as war refugees, although the route through the Balkans is now closed and refugees discouraged from taking the perilous sea journey to Greek islands from Turkey.
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Leftist activists from Greece and other European countries have staged protests outside the transit centers and appear determined to sabotage the deal.
The rumors spread by them that the border would open today led some people who had gone to the centers to return to Idomeni. These people then protesting that the border has not opened.