On April 18, 2019 3:37:25 PM EDT, "J.R. via clamav-users" <clamav-users@lists.clamav.net> wrote:

 Just an FYI thatclamav was linking to libz.so.1.1.4 and upgrading to
 libz.so.1.2.11 resolved the issue with being unable to verify updates.

 Might need to be a check for a minimum zlip version though I don't have
 input which version specifically demonstrates the issue.

zlib 1.1.4 ??? How old of an OS are you trying to run this on?

FYI, this is probably somewhat relevant to your issue:

https://bugzilla.clamav.net/show_bug.cgi?id=12160
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