Hello Team, We run FreeRADIUS Version 2.2.9. We upgraded to RHEL 7.6, post which radiusd does not starup. Error as follows : [app@host967 lib]$ /usr/sbin/radiusd /usr/sbin/radiusd: symbol lookup error: /lib/rlm_perl-2.2.9.so: undefined symbol: Perl_Gthr_key_ptr P.S : We did not recompile/rebuild FreeRadius or Perl post the OS upgrade. Thanks Prayank Chandorkar "Confidentiality Warning: This message and any attachments are intended only for the use of the intended recipient(s). are confidential and may be privileged. If you are not the intended recipient. you are hereby notified that any review. re-transmission. conversion to hard copy. copying. circulation or other use of this message and any attachments is strictly prohibited. If you are not the intended recipient. please notify the sender immediately by return email. and delete this message and any attachments from your system. Virus Warning: Although the company has taken reasonable precautions to ensure no viruses are present in this email. The company cannot accept responsibility for any loss or damage arising from the use of this email or attachment."