Secure Buffalo Linkstation LS-WXL WebAccess with Let's Encrypt

[markusplayz__]

Hi,

I've a Buffalo Linkstation LS-WXL and want to secure my the WebAccess with a SSL certificate of Let's Encrypt.

I've already found the pre-installed openssl program in the directory /usr/local/ssl/bin and created an Let's Encrypt certificate with the help of openssl and https://gethttpsforfree.com, but here's my problem: I don't know how I should create the certificate files out of these three created bolocks and my domain.key file. Further I don't know where I should embed this files on the nas.

My WebAccess Settings:
WebAccess-Service -> enabled
HTTPS/SSL-encryption -> disabled
Use BuffaloNAS.com -> disabled
DNS-Hostname -> xxx.xxx.xx
Configure firewall (UPnP) automatically -> disabled
External port -> 9000
Internal port -> 9000
Exclusive session -> disabled
Session expiry time (in min.) -> unlimited
WebAccess-URL -> https://xxx.xxx.xx:9000

Can someone help me with my problem?

Linkstation LS-WXL
1.75