Error: Can't load SSL certificate

[Horst Simon]

I try to logon to map using dovecot with SSL required. I get following entries in the log:Mar 20 13:49:30 auth: Debug: Loading modules from directory: /opt/lib/dovecot/modules/auth
Mar 20 13:49:30 auth: Debug: Module loaded: /opt/lib/dovecot/modules/auth/lib20_auth_var_expand_crypt.so
Mar 20 13:49:30 auth: Debug: Read auth token secret from /opt/var/run/dovecot/auth-token-secret.dat
Mar 20 13:49:30 auth: Debug: passwd-file /opt/etc/dovecot/userdb:Read 1 users in 0 secs
Mar 20 13:49:30 auth: Debug: auth client connected (pid=26120)
Mar 20 13:49:30 imap-login: Error: Failed to initialize SSL server context: Can't load SSL certificate (ssl_cert setting): error:12800067:DSO support routines::could not load the shared library: filename(libz.so): libz.so: cannot open shared object file: No such file or directory, error:12800067:DSO support routines::could not load the shared library: user=<>, rip=192.168.117.5, lip=192.168.117.2, session=<eX3e+Uv3k8DAqHUF>
Mar 20 13:49:30 imap-login: Info: Disconnected: TLS initialization failed. (no auth attempts in 0 secs): user=<>, rip=192.168.117.5, lip=192.168.117.2, session=<eX3e+Uv3k8DAqHUF

The library files exist in the include directory
[/opt] # find . -name libz* -print
./lib/opkg/info/libzstd.control
./lib/opkg/info/libzstd.list
./lib/libz.so
./lib/libz.so.1
./lib/libz.so.1.2.13
./lib/libzstd.so
./lib/libzstd.so.1
./lib/libzstd.so.1.5.2
./lib/libz.a

Have the dovecot settings the same on other servers and it works, Dovecot is v2.3.18, installed from Entware for QNAP. Any help appreciated.
Horst 


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