Pluto Not supporting SHA-256 in FIPS mode in RHEL 6

Issue

When trying to create an IPsec policy using ipsec auto --add office_tunnel where the connection configuration is

conn office_tunnel
        left=xx.xx.xx.xx
        leftcert=xxxxx
        leftrsasigkey=%cert
        leftid="C=xxx, O=xxxxx, OU=xxxxx, CN=xxxxx, ST=xx, L=xxx"
        right=xx.xx.xx.xx
        rightcert=xxxxx
        rightrsasigkey=%cert
        rightid=""
        authby=rsasig
        rekey=yes
        ike=3des-sha2_256-modp1024
        esp=3des-sha2_256
        auto=add

We get the following error
034 esp string error: SHA2 Not supported in FIPS mode with NSS, enc_alg="3des", auth_alg="sha2_256", modp="modp1024" .

The tunnel is created successfully in non-FIPS mode.