Creating a second bucket using REST API gives error

Creating a second bucket using curl gives error "port is already in use". (First bucket was created successfully).

URL=http://myserver:8091/pools/default/buckets

• About to connect() to myserver port 8091 (#0)
• Trying 192.168.100.6... % Total % Received % Xferd Average Speed Time Time Time Current
  Dload Upload Total Spent Left Speed
  0 0 0 0 0 0 0 0 -::- -::- -::- 0connected
• Connected to myserver (192.168.100.6) port 8091 (#0)
• Server auth using Basic with user 'userId'
  > POST /pools/default/buckets HTTP/1.1
  > Authorization: Basic QWRtaW5pc3RyYXRvcjpub3NxbDA=
  > User-Agent: curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5
  > Host: myserver:8091
  > Accept: /
  > Content-Length: 74
  > Content-Type: application/x-www-form-urlencoded
  >
  } [data not shown]
  < HTTP/1.1 400 Bad Request
  < Server: Couchbase Server 1.8.1-937-rel-enterprise
  < Pragma: no-cache
  < Date: Tue, 08 Jan 2013 17:29:23 GMT
  < Content-Type: application/json
  < Content-Length: 339
  < Cache-Control: no-cache
  <
  { [data not shown]
  100 413 100 339 100 74 2443 533 -::- -::- -::- 4237* Connection #0 to host myserver left intact

• Closing connection #0
  {"errors": {"proxyPort":"port is already in use"}

  ,"summaries":

  Unknown macro: {"ramSummary"}

  }