# Troubleshooting

### I'm getting an error: "sslv3 alert handshake failure"

We don't support SSLv3 due to a security vulnerability: [disablessl3.com](https://disablessl3.com/).

You can force SSLv2 by using the --sslv2 flag with curl on most systems.

You can also just POST to **http**://textbelt.com/text, as opposed to https\://. This will solve the problem, but traffic will not be encrypted (you might be ok with this for hobby projects because [SMS is not secure](http://www.cybersecuritytrend.com/topics/cyber-security/articles/424266-nist-has-it-right-sms-not-secure.htm) to begin with).

### Can I use Textbelt via Tor?

No, because of too much spam/abuse coming through Tor.

### Can I use Textbelt with Postman?

Yes. Here's a screenshot of a Postman configuration that works: <img src="https://i.imgur.com/CVmzH25.png" alt="" data-size="original">

### Why isn't my VOIP number receiving SMS?

Unfortunately, Textbelt does not support sending SMS to VOIP numbers.

## See also

The [Sending & receiving messages](/faq/sending-and-receiving-messages.md) section has more information on common questions, including questions like "Why did my SMS take 2 credits" and how to customize opt-out language.

## Still having problems?

Contact us directly at <support@textbelt.com>.


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