-2. the server has a self-signed certificate (not recommended)
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-3. the certificate is expired.
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-*(SSL (Secure Socket Layer) is a technology to encrypt data as it passes between two computers).*
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-If you dont have a SSL cert yet, there are three ways to get one: buy one, get a free one (eg. via StartSSL) or create your own (not recommended). [You can find more information about setting up SSL and why it's a bad idea to use self-signed SSL here.](help/SSL)
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-Be aware that a browser warning about security issues is something that can make new users feel insecure about the whole friendica project.
-Because of this, Friendica Red will only accept SSL certs signed by a recognized CA and doesn't connect to servers without these kind of SSL. Despite of the negative aspects of SSL, this is a necessary solution until there is an established alternative for this technique.
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-Also you can have problems with the connection to diaspora because some pods require a SSL-certificated connection.
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-If you are just using friendica for a specified group of people on a single server without a connection to the rest of the friendica network, there is no need to use SSL. If you exclusively use public posts, there is also no need for it.
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-If you havn't set up a server yet, it's wise to compare the different provider and their SSL conditions. Some allow the usage of free certificates or give you the access to their certificate for free. Other ones only allow bought certificates from themselves or other providers.