Unable to access the configuration object : REST API failure, code : 500 GatewayError:

Hi

Ceph Cluster 3
Ceph Iscsi Gateway
RHEL 7.5

After enabling jumbo frames on the gateway nodes gateway noes are not accessible .

[root@ ~]# gwcli
Unable to access the configuration object : REST API failure, code : 500
GatewayError:

What could be causing this ?

Thanks
Sadiq