Random ssl key.pem cannot be used - invalid argument

[Joe J]

+++++++++++++++++++++++++++Basic Info++++++++++++++++++++++++++++++++++++
This issue randomly occurs and is not reproducible. This is from a server that had been
up from several days and replicating without error. Normally when this happens a re-install
of both the MariaDB and Galera are required. I have not figured out how to p[prevent a re-install.

+++++++++++++++++++++++++++Mysql Config Info++++++++++++++++++++++++++++++
[mysqld]
query_cache_size=0
binlog_format=ROW
default_storage_engine=innodb
innodb_autoinc_lock_mode=2
innodb_locks_unsafe_for_binlog=1
innodb_doublewrite=1
innodb_log_file_size=5M
# wsrep provider configuration: basic wsrep options
wsrep_provider=/usr/lib/galera/libgalera_smm.so
wsrep_provider_options="gcache.size=256M; gcache.page_size=128M"
wsrep_cluster_address=gcomm://REDACTED
#wsrep_cluster_address=gcomm://
wsrep_cluster_name=MariaDB_Cluster
wsrep_node_address="fl-db01"
wsrep_node_name="fl-db01"
wsrep_sst_method=xtrabackup
wsrep_sst_auth="REDACTED:REDACTED"
wsrep_provider_options=socket.ssl_cert=/etc/mysql/ssl/cert.pem;socket.ssl_key=/etc/mysql/ssl/key.pem
# additional wsrep settings
wsrep_node_incoming_address=REDACTED
wsrep_sst_receive_address=REDACTED
wsrep_slave_threads=16

+++++++++++++++++++++++++++SSL Directory Permissions++++++++++++++++++++++++
XXXXXX@fl-db01:/etc/mysql/ssl$ ls -lah
total 16K
drw-r-xr-x 2 mysql mysql 4.0K Nov 1 05:08 .
drwxr-xr-x 4 root root 4.0K Nov 1 05:04 ..
-rw-r-xr-x 1 mysql mysql 908 Nov 1 05:08 cert.pem
-rw-r-xr-x 1 mysql mysql 916 Nov 1 05:08 key.pem

+++++++++++++++++++++++++++Galera/MariaDB Version Info++++++++++++++++++++++++++++++
Galera 25.3.5-wheezy(rXXXX) by Codership
MariaDB 5.5

+++++++++++++++++++++++++++Syslog Mysql Log output++++++++++++++++++++++++++

Nov 7 19:46:02 fl-db01 mysqld: eight = 1; protonet.bac
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [Note] WSREP: Service thread queue flushed.
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [Note] WSREP: Assign initial position for certification: -1, protocol version: -1
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [Note] WSREP: wsrep_sst_grab()
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [Note] WSREP: Start replication
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [Note] WSREP: Setting initial position to 00000000-0000-0000-0000-000000000000:-1
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [Note] WSREP: protonet asio version 0
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [Note] WSREP: Using CRC-32C (optimized) for message checksums.
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [Note] WSREP: initializing ssl context
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [ERROR] WSREP: could not use private key file '/etc/mysql/ssl/key.pem': Invalid argument
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [ERROR] WSREP: Invalid argument
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [ERROR] WSREP: wsrep::connect() failed: 7
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [ERROR] Aborting
Nov 7 19:46:02 fl-db01 mysqld:
Nov 7 19:46:02 fl-db01 mysqld: 141107 19:46:02 [Note] WSREP: Service disconnected.
Nov 7 19:46:03 fl-db01 mysqld: 141107 19:46:03 [Note] WSREP: Some threads may fail to exit.
Nov 7 19:46:03 fl-db01 mysqld: 141107 19:46:03 [Note] /usr/sbin/mysqld: Shutdown complete
Nov 7 19:46:03 fl-db01 mysqld:
Nov 7 19:46:03 fl-db01 mysqld_safe: mysqld from pid file /var/run/mysqld/mysqld.pid ended
Nov 7 19:46:30 fl-db01 /etc/init.d/mysql[9658]: 0 processes alive and '/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf ping' resulted in
Nov 7 19:46:30 fl-db01 /etc/init.d/mysql[9658]: #007/usr/bin/mysqladmin: connect to server at 'localhost' failed
Nov 7 19:46:30 fl-db01 /etc/init.d/mysql[9658]: error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)'
Nov 7 19:46:30 fl-db01 /etc/init.d/mysql[9658]: Check that mysqld is running and that the socket: '/var/run/mysqld/mysqld.sock' exists!
Nov 7 19:46:30 fl-db01 /etc/init.d/mysql[9658]:
ah_dev@fl-db01:/var/log$
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