Problem in accessing bucket of my AWS S3 account

I tried to establish connection to my aws s3 account like this in my irb console -

AWS::S3::Base.establish_connection!(:access_key_id => ‘my access key’, :secret_access_key => ‘my secret key’, :server => “s3-ap-southeast-1.amazonaws.com”)

And it works well and prompt this -

=> #<AWS::S3::Connection:0x8cd86d0 @options={:server=>“s3-ap-southeast-1.amazonaws.com”, :port=>80, :access_key_id=>“my access key”, :secret_access_key=>“my secret key”}, @access_key_id=“my access key”, @secret_access_key=“my secret key”, @http=#<Net::HTTP s3-ap-southeast-1.amazonaws.com:80 open=false>>

I have a bucket which is based on “Singapore Region” and for that endpoint
i.e. server is: s3-ap-southeast-1.amazonaws.com So when I try to access it using this command -

AWS::S3::Service.buckets

it fetches all buckets in my account correctly -

=> [#<AWS::S3::Bucket:0x8d291fc @attributes={“name”=>“bucket1”, “creation_date”=>2011-06-28 10:08:58 UTC}, @object_cache=[]>, #<AWS::S3::Bucket:0x8d291c0 @attributes={“name”=>“bucket2”, “creation_date”=>2011-07-04 07:15:21 UTC}, @object_cache=[]>, #<AWS::S3::Bucket:0x8d29184 @attributes={“name”=>“bucket3”, “creation_date”=>2011-07-04 07:39:21 UTC}, @object_cache=[]>]

where as bucket1 belongs to Singapore Region and other 2 to US Region. So, when I do this -

AWS::S3::Bucket.find(“bucket1”)

it shows me this error:

AWS::S3::PermanentRedirect: The bucket you are attempting to access must be addressed using the specified endpoint. Please send all future requests to this endpoint.

from /home/surya/.rvm/gems/ruby-1.9.2-p180/gems/aws-s3-0.6.2/lib/aws/s3/error.rb:38:in `raise'
from /home/surya/.rvm/gems/ruby-1.9.2-p180/gems/aws-s3-0.6.2/lib/aws/s3/base.rb:72:in `request'
from /home/surya/.rvm/gems/ruby-1.9.2-p180/gems/aws-s3-0.6.2/lib/aws/s3/base.rb:88:in `get'

from /home/surya/.rvm/gems/ruby-1.9.2-p180/gems/aws-s3-0.6.2/lib/aws/s3/bucket.rb:102:in `find'
from /home/surya/.rvm/gems/ruby-1.9.2-p180/gems/aws-s3-0.6.2/lib/aws/s3/bucket.rb:145:in `objects'
from /home/surya/.rvm/gems/ruby-1.9.2-p180/gems/aws-s3-0.6.2/lib/aws/s3/bucket.rb:313:in `reload!'

from /home/surya/.rvm/gems/ruby-1.9.2-p180/gems/aws-s3-0.6.2/lib/aws/s3/bucket.rb:242:in `objects'
from /home/surya/.rvm/gems/ruby-1.9.2-p180/gems/aws-s3-0.6.2/lib/aws/s3/bucket.rb:253:in `each'
from (irb):5

from /home/surya/.rvm/rubies/ruby-1.9.2-p180/bin/irb:16:in `<main>'

I don’t understand the reason why this is happening cause yesterday same thing was working well. Any guess?? am I missing something here??