Mr Farage was stopped from entering the Brussels building due to issues with his security pass as Theresa May arrived for vital Brexit talks.
MEP Mr Farage said: “Fifteen years I’ve been coming and it’s never happened before.”
He also complained saying “getting in should be easy” and “I’m hardly a security risk”.
After the initial embarrassing issue, Mr Farage was granted entry to the headquarters.
This comes as the veteran politician warned there would be “more to come” if Brexit was not delivered by the Government in the crunch negotiations with the European Union.
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Speaking in Brussels, Mr Farage said: “A week ago she wanted the whole of the UK to stay in a customs union until the end of 2021, that’s the wrong place.
“I think what really happened here is over the course of the weekend, Number 10 was stunned by the genuine level of opposition in the country, within the Conservative Party and from the DUP and knew that a deal on this basis would get voted down in the House of Commons.
“So now is the time to have no deal this week to come back to Britain…everyone thinks she is marvellous, she comes back in a few weeks time and gets a deal.”
A clear concerned Farage, who was one of the mastermind’s behind Brexit, tweeted late on Wednesday October 18: “Mrs May’s acceptance of an extension to the transition period will take us to the next general election which may mean we never leave at all.”
During these uncertain time of Brexit negotiations, Mr Farage has called for the 17.4 million Brexit voters to “stand up and fight again” as he announced plans to “reactivate the people’s army”.
He called for British people to not only contact their pro-Remain MPs, but also Brexiteer MPs, adding: “Those MPs are going to need your support whilst they are put under massive pressure.”
Mr Farage has told Brexit supporters to “pressurise” their MPs to deliver on Brexit and “make them feel the heat”.