Client is not connecting

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If a client does not connect, likely a firewall causes the problem. Let's check this quickly from the command line.
Check the connection
Grab the address and port of your RPort sever. 
Open the configuration file /etc/rport/rport.conf or C:\Program Files\rport\rport.conf with a text editor and look for the line that contains your RPort sever address. Or grab it directly from the console using grep "server =" /etc/rport/rport.conf on Linux or find "server =" "C:\Program Files\rport\rport.conf" on Windows.
The server settings consist of the FQDN or IP Address and the port, divided by colon. Optionally there is a protocol prefix http://.
Example: server = "v0e0vj4l5j1m.users.rport.io:80" The server address is v0e0vj4l5j1m.users.rport.io and the port is 80.
On Linux, execute echo > /dev/tcp/<SERVER>/<PPORT> && echo "All good"||echo "Server not reachable".
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echo > /dev/tcp/v0e0vj4l5j1m.users.rport.io/80 && echo "All good"||echo "Server not reachable"
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-bash: connect: No route to host
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-bash: /dev/tcp/v0e0vj4l5j1m.users.rport.io/80: No route to host
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Server not reachable
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On Windows, use the PowerShell and execute 
Test-NetConnection -ComputerName <SERVER> -Port <PORT>.
If the above check fails, a firewall is blocking the outgoing connections. 
Observe the logs
If the client is not connecting, you should look at the logs.
From a Windows PowerShell execute
Get-Content "C:\Program Files\rport\rport.log"| Select-Object -Last 100.
From a Linux console execute
tail -n 100 /var/log/rport/rport.log.
You might get a hint why the client is not connecting. 
Check for transparent proxies
Some networks have implemented a so-called transparent proxy. All outgoing connection targeting a remote port 80 are intercepted and redirected through an HTTP proxy. Usually, this is done for automatic virus scanning or blockage of malicious websites. Because RPort uses encryption on application layer, a proxy cannot scan the packets send by the rport client. Most proxies deny the connection of they can't consider them as harmless. 
How to solve such issues?
Create an exemption rule in the scanning engine of the proxy and exclude your rport server address from all scanning.
Use multiple ports for client connections
If the above is not possible, try using a different port than 80. If only a few clients are affected, do not change the client connections port of your RPort server. Just bring a second port that can be used as an alternative to the main port. The fastest way for doing this, is using rinetd. Install it by executing apt-get install rinetd, and create a config in /etc/rinetd.conf like the example below. 
/etc/rinetd.conf
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# Open port 8345 and forward to 80. 
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# bindadress    bindport  connectaddress  connectport
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0.0.0.0         8345      127.0.0.1       80 
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Restart with service rinetd restart.
If you have numerous clients connecting through rinetd, you might get an error like socket(): Too many open files. On most distributions, the old system-v-inet is used to manage rinetd. Check systemctl status rinetd . If you get Loaded: loaded (/etc/init.d/rinetd; generated)the modern and de-facto standard, Systemd is not used. 
Create a file /etc/systemd/system/rinetd.service with the following content:
/etc/systemd/system/rinetd.service
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[Unit]
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Description=internet redirection server
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After=network.target network-online.target
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Requires=network-online.target
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​
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[Service]
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User=root
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Group=root
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ExecStart=/usr/sbin/rinetd -f -c /etc/rinetd.conf
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TimeoutStopSec=5s
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LimitNOFILE=1048576
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LimitNPROC=512
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Restart=always
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RestartSec=3
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​
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[Install]
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WantedBy=multi-user.target
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Pay attention to line 11 and 12. Now you have increased the limits to its maximum. To activate the new systemd service file, execute
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systemctl daemon-reload
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systemctl stop rinetd
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systemctl start rinetd
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systemctl status rinetd # should print "loaded /etc/systemd/system/rinetd.service"
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systemctl enable rinetd
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Contents
Check the connection
Check for transparent proxies