Receive header underflow - only 0 bytes received (4 expected).

[605adi]

Nagios core : nagios-4.4.6
nagios-plugins : release-2.3.3
Nrpe : nrpe-4.0.3
System : Ubuntu 18.04.6 LTS

Endpoint:- I want to run NRPE without SSL
Error:-

1. could not complete ssl handshake --> with ssl
2. Received header underflow - only 0 bytes received (4 expected) --> without ssl

Nrpe installation steps with ssl in all machine :
cd /tmp
wget --no-check-certificate -O nrpe.tar.gz https://github.com/NagiosEnterprises/nrpe/archive/nrpe-4.0.3.tar.gz
tar xzf nrpe.tar.gz
sudo ./configure --enable-command-args --with-ssl-lib=/usr/lib/x86_64-linux-gnu/
make all
make install-config
make install-init
systemctl enable nrpe.service
systemctl start nrpe.service

Nrpe installation steps without ssl in all machine :
cd /tmp
wget --no-check-certificate -O nrpe.tar.gz https://github.com/NagiosEnterprises/nrpe/archive/nrpe-4.0.3.tar.gz
tar xzf nrpe.tar.gz
./configure --enable-command-args --disable-ssl
make all
make install-config
make install-init
systemctl enable nrpe.service
systemctl start nrpe.service

Command used with ssl :
/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 ---> output : NRPE v4.0.3
/usr/local/nagios/libexec/check_nrpe -H x.x.x.x -----> output : CHECK_NRPE: Error - Could not connect to x.x.x.x Check system logs on x.x.x.x i.e ssl handshake error when looked into system logs.

Command used without ssl :
/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 ---> output : NRPE v4.0.3

/usr/local/nagios/libexec/check_nrpe -H x.x.x.x -----> output : CHECK_NRPE: Receive header underflow - only 0 bytes received (4 expected).

Nrpe.cfg file :-
remote host is allowed.
Note :
check_ping , chech_icmp , check_http all working except check_nrpe.
Could you please help me with this error . I want to run NRPE without SSL . I am not using Xinetd or any third party tool.
Thanks.

[rpv-tomsk]

#277 should help