[arm-allstar] ddns update using curl in cron

[David]

I recently started using DNS-NOW ddns service and followed their 
suggestion to use curl in the cron file for updating my IP. Everything 
works fine although the Linux log, that I look at from Supermon, has the 
message shown below every time the curl statement runs.  Not sure what 
this all means so I would appreciate a few words of translation and if 
this indicates a problem.
The basic form of the updater in cron is this: *curl -u 
<email>:<password> "https://now-dns.com/update?hostname=<hostname>"*

 From Iinux log:

Nov 19 09:20:01 DVD2 crond[23964]: PAM unable to dlopen(/usr/lib/security/pam_unix.so): /usr/lib/libc.so.6: version `GLIBC_2.25' not found (required by /usr/lib/libcrypt.so.1)
Nov 19 09:20:01 DVD2 crond[23964]: PAM adding faulty module: /usr/lib/security/pam_unix.so
Nov 19 09:20:01 DVD2 systemd[1]: Started Process Core Dump (PID 23965/UID 0).
Nov 19 09:20:01 DVD2 systemd-coredump[23966]: Process 23964 (crond) of user 0 dumped core.
                                               
                                               Stack trace of thread 23964:
                                               #0  0x0000000076b13594 __pthread_initialize_minimal (libpthread.so.0)

- David