Repeating TLS Error In Log File

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I use TLS and SRTP on all my extensions. I use openssl and distribute my root certificate to my endpoints. Most of the time my calls work just fine.

Sometimes I receive a repeating error in my log files however, and I don’t know why this is happening. I’m wondering if this is really from the TLS connection for SIP, or an underlying error with SRTP decoding.. I sometimes get this message in the log when things seems to be working fine. Is there a better way to debug exactly why I’m getting this error? Sometimes I have dozens of these errors in a row.

My openssl certificate chain checks out fine with openssl verify command ..

[2015-10-26 12:23:42] WARNING[9915] tcptls.c: FILE * open failed!
[2015-10-26 12:23:42] VERBOSE[9916] tcptls.c: == Problem setting up ssl connection: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca