@gopal
Thanks for your reply.
"I don't think signal is blocking the VPN. The issue is most likely the VPN is assigning an IP address that is considered as a spam source by signal's spam detection code"
Effectively that would amount to the same thing.
I tried to send another message, only this time the captcha didn't appear at all and instead Signal showed me a very dark page which just said:
Webpage not available
The webpage at https://signalcaptchas.org/challenge/generate.html could not be loaded because: net::ERR_NAME_NOT_RESOLVED
So it seems their captcha is even more broken now! And it still won't let me send any messages.
I still haven't switched off my VPN but I might have to do that next, unfortunately. I find it disappointing that I even need to consider this.
Like you, I am currently using Orbot as my VPN and, until now, I hadn't experienced this kind of problem with Signal, which is why I was surprised when it happened. And since the captcha failed to submit even with different circuits, it seems they are blocking the entire tor network, essentially blocking anyone using the Orbot VPN.
Thanks for the molly recommendation. I had heard about that before but haven't tried it and I didn't know it directly supports tor on the app. I will keep that in mind in future, although if Signal is blocking IP addresses for the tor network, I assume a molly user would be blocked by Signal just the same.
Thanks again for your suggestions!
@signalapp
#signal #captcha #privacy #signalapp #vpn #orbot #tor #molly