Ireland headed into the game brimming with confidence on the back of a five-game unbeaten run and looking to lay the foundation for victory with another shut-out.
They reached half-time with 50% of that mission completed, but having shown little sign of the form which accounted for Macedonia in Skopje and then Italy in Liege in June.
Having drawn 1-1 in Slovakia, they knew Weiss' men would be no push-over, and just how much of a threat the visitors represented quickly became clear.
Ireland were disjointed to say the least, and as Slovakia grew in confidence, it was they who looked the more likely to open the scoring.
Given was grateful to see Vladimir Weiss jnr, the manager's son, fire straight at him with 19 minutes gone, and the Aston Villa man had to get down well to his left nine minutes later to claw Filip Holosko's header out of the bottom corner.
Trapattoni's suspicion that Slovakian playmaker Marek Hamsik would start despite being rated at only 50-50 with a knee injury on the eve of the game proved correct.
He linked repeatedly with Juraj Kucka behind him and Miroslav Stoch and Holosko ahead of him, and as full-backs Peter Pekarik and Marek Cech exploited the space behind opposite numbers Stephen Ward and John O'Shea, Ireland found themselves stretched.
But for all that, it was they who created the best opening of the half, although they had to wait until the 38th minute to do so.
Damien Duff came off the right wing to play a one-two with Keith Andrews and continued his run into the box to receive the return pass.
Colin Calderwood's Hibernian found respite in the Scottish Communities League Cup with a comprehensive 5-0 win over Berwick at Easter Road.
Martin Scott scored twice, starting the rout after 11 minutes, with Akpo Sodje adding a second after 38 minutes as Hibs, struggling in the SPL, ended hopes of an upset in the opening half.
Garry O'Connor headed in his fourth of the season six minutes into the second half, Scott added his second after 58 minutes and Ivan Sproule struck his first since returning to Edinburgh after 87 minutes as Irn-Bru Third Division Berwick returned south down the A1 empty handed.
Hibs' attention now returns to the SPL and Sunday's Edinburgh derby with Hearts at Tynecastle.
Pressure has been building on Calderwood, who now has a record of 10 wins in more than 10 months as Hibs boss and has been linked with a move away from Leith, and a side seventh in the bottom tier were welcome visitors.
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