I recently changed the userdb to sql, using a stored procedure and since then, every so often, maybe 2-3 times per day I see errors like these in the maillog:

Apr 17 13:33:04 imap1 dovecot[41212]: auth-worker(41325): Error: mysql(192.168.1.95): Connect failed to database (virtualusers): SSL connection error: error:140BA041:SSL routines:SSL_new:malloc failure - waiting for 1 seconds before retry Apr 17 13:33:05 imap1 dovecot[41212]: auth-worker(41325): Error: mysql(192.168.1.95): Connect failed to database (virtualusers): SSL connection error: SSL_CTX_new failed - waiting for 5 seconds before retry Apr 17 13:33:10 imap1 dovecot[41212]: auth-worker(41325): Error: mysql(192.168.1.95): Connect failed to database (virtualusers): SSL connection error: SSL_CTX_new failed - waiting for 25 seconds before retry Apr 17 13:33:35 imap1 dovecot[41212]: auth-worker(41325): Error: mysql(192.168.1.95): Connect failed to database (virtualusers): SSL connection error: SSL_CTX_new failed - waiting for 125 seconds before retry Apr 17 13:34:04 imap1 dovecot[41212]: auth-worker(41325): Error: sql(user@domain.com,1.2.3.4,): User query failed: Not connected to database

Is this the auth-worker running out of memory ? 

I have these settings:

auth_cache_size = 8 k auth_mechanisms = plain login auth_socket_path = /var/run/dovecot/auth-master auth_verbose = yes auth_worker_max_count = 130

service auth { unix_listener auth-master { mode = 0600 user = vuser } user = root client_limit=1500 }​​

I recently changed the userdb to sql, using a stored procedure and since then, every so often, maybe 2-3 times per day I see errors like these in the maillog:

Apr 17 13:33:04 imap1 dovecot[41212]: auth-worker(41325): Error: mysql (192.168.1.95): Connect failed to database (virtualusers): SSL connection error: error:140BA041:SSL routines:SSL_new:malloc failure - waiting for 1 seconds before retry Apr 17 13:33:05 imap1 dovecot[41212]: auth-worker(41325): Error: mysql (192.168.1.95): Connect failed to database (virtualusers): SSL connection error: SSL_CTX_new failed - waiting for 5 seconds before retry Apr 17 13:33:10 imap1 dovecot[41212]: auth-worker(41325): Error: mysql (192.168.1.95): Connect failed to database (virtualusers): SSL connection error: SSL_CTX_new failed - waiting for 25 seconds before retry Apr 17 13:33:35 imap1 dovecot[41212]: auth-worker(41325): Error: mysql (192.168.1.95): Connect failed to database (virtualusers): SSL connection error: SSL_CTX_new failed - waiting for 125 seconds before retry Apr 17 13:34:04 imap1 dovecot[41212]: auth-worker(41325): Error: sql (user@domain.com,1.2.3.4,<5ohIy/wyHvox5b/p>): User query failed: Not connected to database

Is this the auth-worker running out of memory ? 

I have these settings: auth_cache_size = 8 k auth_mechanisms = plain login auth_socket_path = /var/run/dovecot/auth-master auth_verbose = yes auth_worker_max_count = 130

service auth { unix_listener auth-master { mode = 0600 user = vuser } user = root client_limit=1500 } ​ ​