Failed to store value to server: Network error

UPDATE: I removed the port number from the host string and it started working again. O_O

Example before: localhost:8091 (doesn’t work)

Example after: localhost (works)

PHP 5.3
Couchbase 1.1.5 ( 5.3 Non Thread Safe (NTS) x86 )
Server 2008 Standard R2

This error started happening earlier today whenever the set command is called. Couchbase is on the same box as IIS. However, when pointing IIS to a replica it functions fine.