toilet leak

The toilet in the downstairs loo is connected to the cistern by way of a pipe roughly 12" in length by 3" diameter.There is a small leak from where the pipe enters the toilet bowl whenever the toilet is flushed.Is there anything that will stick to the porcelain in order to seal where the toilet meets the pan

is there a white flange for the white pipe to enter the bowl through.

an idea - try twisting this flange around 180 deg as sometimes when they are being put in it bends the seal around the edge and leaks.
by twisting it - you can fix the problem - has fixed the leaky 4" outlet flange on my bowl before.

k

slighty pull the pipe out of the toilet and pump silcone around the flange, push it back in. works a treat!!