Linksys App bug with port mapping

So I have the Linksys app installed on my Android phone. My router, WRT1900AC, is set up using port mapping. The port mapping is for an ssh app to control my 3 web servers. Each servers internal port is 22 and each servers external port is 20, 22, and 23 each one mapped to port 22. When signed in the the routher itself, not through the app, I can configuer these ports fine. However when I attempt to configuer these ports or the ip appress through the app, I get an error saying the port is in use. It seems the app is seeing the three servers using the same internal port and throwing an error.
Has anyone else experienced this?

I recommend you not use ports in the first 1000 unless they are for the standard server they are specified for. This is a good IT policy.
Example:
Port 22 External to internal IP Address of SSH server port
Port 21 External to internal IP Address of FTP server port
Instead use undefined ports in the higher end of the range.
Example:
Port 10001 External to internal IP Address of SSH server port
Port 10002 External to internal IP Address of SSH server port
The Linksys stock firmware will only do DNS proxing which isn't great for server networks.
For this application I recommend OpenWRT McWRT v1.0.5:
https://github.com/Chadster766/McWRT/releases
Install luci-ssl to enable SSL access and open router port 443 for standard secure remote access.
FYI:
Unless you have a USB to TTL cable for firmware recovery I recommend always flashing OpenWRT using the Linksys stock UI. This will put the Linksys stock firmware into the alternate boot image in case manual recovery is needed.
Do not delete the LAN, WAN and WAN6 interfaces. Pay attention to OpenWRT notices that say things are not reversible. OpenWRT can be unforgiving in those circumstances. If you have the $9.00 USB to TTL cable it won't matter because you can always load firmware through the boot loader.
OpenWRT McWRT has some issues:
https://github.com/Chadster766/McWRT/issues
Please remember to Kudo those that help you.
Linksys
Communities Technical Support

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