Giuseppe Sannino's first 45 minutes as Watford head coach have ended without a goal at Ipswich Town, but his side came close to taking the lead.
Forward Diego Fabbrini had the Hornets' best chance of the opening period when he rattled the home side's woodwork from a tight angle.
However, Watford relied on the defence to keep them on level terms moments after when Tommy Smith headed Aaron Cresswell's cross goalwards, only to see his effort cleared from two yards out.
The visitors' keeper Manuel Almunia was called on later in the first half to tip David McGoldrick's curling effort over the crossbar.
Ipswich will be hoping to extend their unbeaten run to five games, having drawn 0-0 with Nottingham Forest last Saturday.
