Problem:
When trying to access your OpenStage 40 IP phone using Chrome or Firefox, you see the following error message:
ERR_SSL_VERSION_OR_CIPHER_MISMATCH
Solution:
This is because your OpenStage firmware currently does not support a recent TLS version.
You can easily resolve this by using an old browser that does not block old TLS versions.
Just download Firefox 50.0.2 portable from (Linux version) https://releases.mozilla.org/pub/firefox/releases/50.0.2/linux-x86_64/en-US/ , download the .tar.bz2 from the link, untar it using tar xjvf *.tar.bz2, cd firefox and run it portably with autoupdate disabled using
mkdir -p profile && ./firefox -profile $PWD/profile