Problem with Centos 6.1

[Martins Purins]

I have reinstalled two servers. One with C6.1 another with C4. and set
up shib SP from rpm binary
C4
shibboleth.i386                          2.4.3-2.2.el4          installed
C6.1
shibboleth.x86_64
2.4.3-2.2.el6

Both installations have identical fresh DEFAULT INSTALLATIONS with
identical configurations except
 diff shibboleth2.xml shibboleth2.xml.c4
23c23
<     <ApplicationDefaults entityID="https://c6/shibboleth"
---
>     <ApplicationDefaults entityID="https://c4/shibboleth"

Problem with c6
https://c6/Shibboleth.sso/Metadata returns error
"Metadata Request Failed"

Any solution

P.S.
ls -la /opt/shibboleth/lib64/libcurl.so.4
lrwxrwxrwx. 1 root root 16 Dec 19 18:23
/opt/shibboleth/lib64/libcurl.so.4 -> libcurl.so.4.2.0

ldconfig -v | grep libcur
ldconfig: /etc/ld.so.conf.d/kernel-2.6.32-131.21.1.el6.x86_64.conf:6:
duplicate hwcap 0 nosegneg
       libcurl.so.4 -> libcurl.so.4.1.1

I have done workaround but I think it is not the best way, because of
possible problems with other software
touch /etc/ld.so.conf.d/libcurl-shibd-x86_64.conf
echo "/opt/shibboleth/lib64" >  /etc/ld.so.conf.d/libcurl-shibd-x86_64.conf

ldconfig -v | grep curl
ldconfig: /etc/ld.so.conf.d/kernel-2.6.32-131.21.1.el6.x86_64.conf:6:
duplicate hwcap 0 nosegneg
       libcurl.so.4 -> libcurl.so.4.2.0
       libcurl.so.4 -> libcurl.so.4.1.1

Thanks