SSL Certificate expired, still Certbot unable to renew

Something changed, I can no longer reach port 8100:

openssl s_client -connect api2.eegloo.in:8100 --showcerts
140378008113600:error:0200206F:system library:connect:Connection refused:../crypto/bio/b_sock2.c:110:
140378008113600:error:2008A067:BIO routines:BIO_connect:connect error:../crypto/bio/b_sock2.c:111:
connect:errno=111