Apache fails to start. The following error can be observed in
[Thu Feb 20 01:29:50 2014] [error] Init: Unable to read server certificate from file /usr/local/psa/var/certificates/certcl3mSZ4 [Thu Feb 20 01:29:50 2014] [error] SSL Library Error: 218529960 error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag [Thu Feb 20 01:29:50 2014] [error] SSL Library Error: 218595386 error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error
Please be informed that Plesk Panel does not change certificates automatically; additionally it prevents incorrect certificates be uploaded via Plesk Control Panel user interface.
Regenerated new self-signed key/certificate pair according to this instructions.