The Web Summit began its stay in Lisbon tonight with a glitzy opening ceremony attended by a capacity crowd of 15,000 at the Meo arena and 3,000 more watching outside.

But it was not a complete success, with the Wi-Fi issues that dogged the summit in Dublin in recent years appearing to follow it to the Portuguese capital.

Web Summit co-founder and CEO, Paddy Cosgrave, attempted to carry out a Facebook Live broadcast while on stage, but had to give up due to poor connectivity.

He later returned to the stage and tried again using a different network, and succeeded.

A spokesperson for Web Summit later clarified that Mr Cosgrave had accidentally connected to the wrong network, before rectifying the problem.

However, the rest of the opening ceremony went without a hitch, including an interview with actor Joseph-Gordon Levitt, and contributions from the Portuguese Prime Minister Antonio Costa, the former EU president José Manuel Barroso, and the former President of the UN General Assembly

The event is taking place at the purpose-built Feira Internacional De Lisboa conference centre and neighbouring Meo Arena.

The number of attendees is up, with 53,000 registered ticket holders expected to come to the main event, up from almost 28,000 in Dublin last year.

A further 19,000 people will attend community and side events, up from 14,000 in 2015.

It is the first year that the technology conference has been held outside of its home city of Dublin, following the surprise announcement last year that it was moving abroad.

Among the reasons it cited for the controversial move was that it was outgrowing the RDS venue.

It also claimed it had been unable to secure commitments from authorities around hotel prices, assistance with transport and access.

Ironically, it also said that it was having problems securing adequate Wi-Fi for the venue.

As a result of the decision to move from Dublin, there is likely to be much attention focused on whether Lisbon can deliver a similar or better experience to visitors.

As well as supporting the event, the Portuguese government is making big efforts to capitalise on the presence of so many tech leaders in the country.

It is launched a special campaign to highlight the incentives like tax breaks and investment opportunities that are available in the country to technology investors.

The tech conference was attended by 400 people when it started in Dublin in 2010.

Since then it has attracted some of the biggest names from the international technology sector, like Tesla and SpaceX founder Elon Musk, Dell Technologies founder Michael Dell, Twitter co-founder Jack Dorsey and the CEO of Netflix Reed Hastings.

In recent years it has also branched out to include speakers from sectors that are not purely technology based, like entertainment, fashion, health and sport.

Among the 660 speakers this year are Facebook Chief Technology Officer,  Mike Schroepfer, co-founder of dating app Tinder Sean Rad, Executive Chairman of Cisco John Chambers, retired footballers Ronaldinho and Luis Figo, and actor/director Joseph Gordon-Levitt.

A number of political leaders from across Europe are also attending.

Taoiseach Enda Kenny and the Minister of State for Europe, Dara Murphy were invited, but are unable to attend due to prior commitments, a Government spokesperson said.

The IDA and Enterprise Ireland will, however, have representatives at the conference.

As with previous years there are 21 individual "summits" taking place under the Web Summit umbrella, including the Night Summit pub crawls that were a particular hit with delegates in Dublin, are also taking place.