Jackett disappointed Portsmouth didn't hang on for victory against Wycombe WanderersÂ
Brett Pitman thought he'd nicked a late winner with an 86th-minute header to give the Blues a 2-1 lead.
Gareth Evans had equalised for the hosts to cancel out Bryn Morris' first-half opener.
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Hide AdBut Joe Jacobson netted a penalty three minutes later to grab his side a 2-2 draw.
Jackett was pleased with the application his troops displayed to battle back from behind.
But he was disheartened Pompey couldn't hang on to win the match.Â
The Blues boss said: '˜We worked really hard to get back into the game.
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Hide Ad'˜We were 2-1 up on 88 minutes and disappointed not to have seen the game out.
'˜Defensively it was a tough one to get a clean sheet '“Â there were too many free-kicks against and then as they're putting balls into our box there's some danger.
'˜We repeatedly got attracted and drawn to the header too many times and, ultimately, it has cost us.
'˜It was then tough for us to then handle that situation.'