im testing an upgrade to ES 2.1 and kibana to 4.3.1 and when i try to start kibana i get the following error:
./kibana
./../node/bin/node: error while loading shared libraries: libstdc++.so.6: wrong ELF class: ELFCLASS32

any idea what might cause it?

Thanks.

im running on Scientific Linux release 6.4 (Carbon) (64Bit) and downloaded kibana-4.3.1-linux-x64.tar.
i know what the problem is:
[root@XXX bin]# ldd node
linux-vdso.so.1 => (0x00007fff17ff8000)
librt.so.1 => /lib64/librt.so.1 (0x00007f7cb3f47000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f7cb3d43000)
libstdc++.so.6 => not found
libm.so.6 => /lib64/libm.so.6 (0x00007f7cb3abe000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f7cb38a8000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f7cb368a000)
libc.so.6 => /lib64/libc.so.6 (0x00007f7cb32f6000)
/lib64/ld-linux-x86-64.so.2 (0x00007f7cb4159000)

    libstdc++.so.6 => not found, trying to find  a solution for that. the files exists:
lrwxrwxrwx. 1 root root     19 Jan  8  2015 /usr/lib64/libstdc++.so.6 -> libstdc++.so.6.0.13

-rwxr-xr-x. 1 root root 930192 Mar 23  2015 /usr/lib64/libstdc++.so.6.0.13
but for some reason it doesnt see it in its rpath.
any linux-savvy people could help out here?
Do you see:
        libstdc++.so.6 (libc6,x86-64) => /lib64/libstdc++.so.6
        libstdc++.so.6 (libc6) => /lib/libstdc++.so.6
If not try running ldconfig -v and see if that fixes it. If not try doing:
export LD_LIBRARY_PATH=/usr/lib64
Then start kibana.
thanks for the reply, that would probably helped me to find the problem faster.
the problem was, that for some reason, the lib file that was in the 64 bit folder was 32 bit:

file /usr/lib64/libstdc++.so.6

/usr/lib64/libstdc++.so.6: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
i copied a 64 bit lib file from a different node and it worked:

ldd /var/opt/kibana/node/bin/node

linux-vdso.so.1 =>  (0x00007fffb73ff000)

librt.so.1 => /lib64/librt.so.1 (0x00007feac9923000)

libdl.so.2 => /lib64/libdl.so.2 (0x00007feac971f000)

libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00007feac9418000)

libm.so.6 => /lib64/libm.so.6 (0x00007feac9194000)

libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007feac8f7e000)

libpthread.so.0 => /lib64/libpthread.so.0 (0x00007feac8d60000)

libc.so.6 => /lib64/libc.so.6 (0x00007feac89cc000)

/lib64/ld-linux-x86-64.so.2 (0x00007feac9b35000)