If you don't have a dh.pem file in `/etc/yunohost/certs/YOUR DOMAIN/dh.pem` you should built it befor to install the app because it could take a long time.
You could built it by this cmd : `sudo openssl dhparam -out /etc/yunohost/certs/YOUR DOMAIN/dh.pem 2048 > /dev/null`
If you want a web client you can also install riot with this package : https://github.com/YunoHost-Apps/riot_ynh . But
## Access by federation
To be accessible by the federation you need to put this following line in the dns configuration :
```
_matrix._tcp.<yourdomain.com><ttl> IN SRV 10 0 <port><synapse.server.name>
```
for example
```
_matrix._tcp.example.com. 3600 IN SRV 10 0 8448 synapse.example.com.
```
## About debian package
It's important to know that this package use the debian backport repos. So this app will enable the debian backport repos it will install some package from this repos. If you remove this app you could keep some package form backport on your server.
Important Security Note
=======================
We do not recommend running Riot from the same domain name as your Matrix
homeserver (synapse). The reason is the risk of XSS (cross-site-scripting)
vulnerabilities that could occur if someone caused Riot to load and render
malicious user generated content from a Matrix API which then had trusted
access to Riot (or other apps) due to sharing the same domain.
We have put some coarse mitigations into place to try to protect against this
situation, but it's still not good practice to do it in the first place. See
https://github.com/vector-im/riot-web/issues/1977 for more details.
