Check the hostname you are trying to use in BW – if it has underscore in it “_” then you may see this issue .
According to RFC 2396, RFC 952, and RFC 1123, the underscore (_) is not a valid character in a hostname . Underscores are not allowed (RFC 952 in the "ASSUMPTIONS" section).
Here is a fragment of [RFC-952]: <name> ::= <let>[*[<let-or-digit-or-hyphen>]<let-or-digit>]
Solution : Change your hostname, if necessary, so that it does not contain an underscore (_). You can use a dash (-) instead of an underscore.