Ubuntu 16 : Kannel : System error 13

got an error 13 when running kannel service

AT2[xxxxxxxxxxx]: open failed!
ERRNO=13 ERROR: System error 13: Permission denied

to resolve, add kannel to dialout group

usermod -a -G dialout kannel


Ubuntu 16 : Certificate Verify Failed

An application, hosted on an Ubuntu 16 box, calling a URL returned "certificate verify failed".

Checking if the URL is accessible, tested calling it via wget. Got "Unable to locally verify the issuer's authority."

To test URL access and response, use openssl...

# openssl s_client -showcerts -connect <host>:<port>






To install the needed certificate...

# cd /usr/local/share/ca-certificates/


# sudo mkdir <source name>
# sudo chmod 755 <source name>


# cp .crt .


# sudo chmod 644 .crt

# sudo dpkg-reconfigure ca-certificates

select new certificate to allow, then click ok

# sudo update-ca-certificates


Retest URL access and response...

OK.