LS-Nonce? Facebook has a bug in the authentication code and makes login unfeasible – Applications and Software – Tecnoblog

If you are Facebook user and unable to login your account for authentication code issues, you are not alone. Several people are reporting the same error, in Brazil and in more countries. According to reports, the Facebook sends code “LS-Nonce” instead of the six digits required for social network login validation.

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Facebook (Image: Vitor Pádua / Tecnoblog)

The complaints are very similar, and their frequency has increased in the last few hours. On Twitter, users say they have tried to repeat access recovery several times, without success.

O reader Matheus Gomes warned us about the problem this Tuesday morning (29). He said he missed an entire morning of work because he didn’t receive the two-factor authentication code. In addition to Matthew, more brazilian users face the problem.

Abroad, there are people experiencing the same difficulty:

What is the LS-Nonce sent by Facebook?

“Nonce” is a cryptographic token — an arbitrary code for single use, which may consist of numbers or letters. Although the concept is linked to the identity and security of accounts, this term should not be the string sent to users who need an authentication code to log in or recover a Facebook account.

As the system itself informs, it is necessary to enter a sequence of 6 numbers to regain access to the profile.

Facebook sends LS-Nonce code to users (Image: Reproduction/Twitter)
Facebook sends LS-Nonce code to users (Image: Reproduction/Twitter)

Engineers and other IT professionals who discuss the topic in forums believe that the “LS-Nonce” sent by Facebook is an autoresponder sent by mistake. The term should be replaced by the unique access code of each user at the time of login recovery.

Something we noticed while investigating this issue was the presence of unofficial accounts offering help to regain access to Facebook. The profiles usually had few followers and tried to direct the user to another social network.

It is important to exercise caution when trying to retrieve the access code by non-traditional means, as there is no certainty about the credibility of these services. It is worth remembering that the authentication code is sensitive information, and sharing it with strangers could result in the loss of your account.

What does Facebook say?

Although it has become more recurrent in the last few hours, the problem is not something new — it has already been reported by several users on other occasions, in 2020 and 2021. There are discussion threads about the case in forums, and more reports on social networks about bugs. similar to this one.

On Twitter, a user even questioned Meta’s official profile about the situation. But the official account’s response directed her to a platform support page with more general directions on two-factor authentication on Facebook. the own user saidthen that the solution provided didn’t work for her problem:

O technoblog contacted Facebook’s advisory to find out if the company has an official position on the problem to share. We await the company’s response and this text may be updated to add it later.

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