What may cause an ERR_CONNECTION_RESET error, on xampp while using session

Question

I have problem with xampp (Windows) where I have session_start(); in my file but it like drops that request...

When I try to access page with localhost/folder/index.php it works but when i try external ip/folder/index.php or 127.0.0.1/folder/index.php or [::1]/folder/index.php it just drops connection (tried multiple browsers and chrome gives ERR_CONNECTION_RESET... I am clueless and I desperately need help... It worked when I removed session_start(); from my file... When I make new file with session_start(); it still doesn't work...

Some error.log lines

[Sun Jan 10 19:33:45.805036 2016] [:error] [pid 3176:tid 1888] [client myip:50143] script 'C:/xampp/htdocs/h3x1t/i\xc2\xb4\xc2\xb4.php' not found or unable to stat
[Sun Jan 10 20:02:40.330149 2016] [ssl:warn] [pid 24588:tid 552] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Sun Jan 10 20:02:40.373728 2016] [mpm_winnt:notice] [pid 24588:tid 552] AH00354: Child: Starting 150 worker threads.
[Sun Jan 10 20:04:25.949925 2016] [mpm_winnt:notice] [pid 29460:tid 564] AH00428: Parent: child process 24588 exited with status 3221225477 -- Restarting.
[Sun Jan 10 20:04:26.568746 2016] [ssl:warn] [pid 29460:tid 564] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Sun Jan 10 20:04:26.615700 2016] [mpm_winnt:notice] [pid 29460:tid 564] AH00455: Apache/2.4.18 (Win32) OpenSSL/1.0.2e PHP/7.0.1 configured -- resuming normal operations
[Sun Jan 10 20:04:26.615700 2016] [mpm_winnt:notice] [pid 29460:tid 564] AH00456: Apache Lounge VC14 Server built: Dec  9 2015 10:17:39
[Sun Jan 10 20:04:26.615700 2016] [core:notice] [pid 29460:tid 564] AH00094: Command line: 'c:\\xampp\\apache\\bin\\httpd.exe -d C:/xampp/apache'
[Sun Jan 10 20:04:26.622190 2016] [mpm_winnt:notice] [pid 29460:tid 564] AH00418: Parent: Created child process 26200
[Sun Jan 10 20:04:27.302705 2016] [ssl:warn] [pid 26200:tid 560] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Sun Jan 10 20:04:27.475560 2016] [ssl:warn] [pid 26200:tid 560] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Sun Jan 10 20:04:27.518770 2016] [mpm_winnt:notice] [pid 26200:tid 560] AH00354: Child: Starting 150 worker threads.
[Sun Jan 10 20:04:28.693791 2016] [mpm_winnt:notice] [pid 29460:tid 564] AH00428: Parent: child process 26200 exited with status 3221225477 -- Restarting.
[Sun Jan 10 20:04:29.379751 2016] [ssl:warn] [pid 29460:tid 564] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Sun Jan 10 20:04:29.425188 2016] [mpm_winnt:notice] [pid 29460:tid 564] AH00455: Apache/2.4.18 (Win32) OpenSSL/1.0.2e PHP/7.0.1 configured -- resuming normal operations
[Sun Jan 10 20:04:29.425188 2016] [mpm_winnt:notice] [pid 29460:tid 564] AH00456: Apache Lounge VC14 Server built: Dec  9 2015 10:17:39
[Sun Jan 10 20:04:29.425188 2016] [core:notice] [pid 29460:tid 564] AH00094: Command line: 'c:\\xampp\\apache\\bin\\httpd.exe -d C:/xampp/apache'
[Sun Jan 10 20:04:29.430191 2016] [mpm_winnt:notice] [pid 29460:tid 564] AH00418: Parent: Created child process 30668
[Sun Jan 10 20:04:30.081357 2016] [ssl:warn] [pid 30668:tid 608] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Sun Jan 10 20:04:30.254197 2016] [ssl:warn] [pid 30668:tid 608] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Sun Jan 10 20:04:30.297173 2016] [mpm_winnt:notice] [pid 30668:tid 608] AH00354: Child: Starting 150 worker threads.
[Sun Jan 10 20:06:24.444492 2016] [:error] [pid 30668:tid 1896] [client ::1:60405] script 'C:/xampp/htdocs/h3x1t/contracts.php' not found or unable to stat, referer: http://localhost/h3x1t/index

Answer 1

I have XAMPP with PHP7 and the same problem...

I've changed in php.ini: session.use_only_cookies from 0 to 1 and all works.