I have been struggling last few days abnormal server behaviour. It seems like apache2 serv doesn't cooperates with ssl library. command: ends up with an error Code: 139766340863104:error:0200206F:system library:connect:Connection refused:../crypto/bio/b_sock2.c:110: 139766340863104:error:2008A067:BIO routines:BIO_connect:connect error:../crypto/bio/b_sock2.c:111: This server has valid let's encrypt cert. Would you give me a hand with that please. here are current dpkg Code: Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-===============================-================-============-========================================================================= un apache2-api-20120211-openssl1.1 <none> <none> (no description available) ii libcrypt-openssl-bignum-perl 0.09-1+b1 amd64 Perl module to access OpenSSL multiprecision integer arithmetic libraries un libcrypt-openssl-dsa-perl <none> <none> (no description available) un libcrypt-openssl-pkcs10-perl <none> <none> (no description available) un libcrypt-openssl-pkcs12-perl <none> <none> (no description available) ii libcrypt-openssl-random-perl 0.15-1+b1 amd64 module to access the OpenSSL pseudo-random number generator ii libcrypt-openssl-rsa-perl 0.31-1+b1 amd64 module for RSA encryption using OpenSSL un libcrypt-openssl-x509-perl <none> <none> (no description available) un libengine-pkcs11-openssl <none> <none> (no description available) ii openssl 1.1.1d-0+deb10u4 amd64 Secure Sockets Layer toolkit - cryptographic utility un openssl-blacklist <none> <none> (no description available) un perl-openssl-abi-1.1 <none> <none> (no description available) ii perl-openssl-defaults:amd64 3 amd64 version compatibility baseline for Perl OpenSSL packages ii python-openssl 19.0.0-1 all Python 2 wrapper around the OpenSSL library un python-openssl-dbg <none> <none> (no description available) un python-openssl-doc <none> <none> (no description available) ii python3-openssl 19.0.0-1 all Python 3 wrapper around the OpenSSL library un python3-openssl-dbg <none> <none> (no description available)