What is the Kashmir issue, which is repeatedly raised by Pakistan, in every forum? Why doesn't our country settle it once and for all? Then, may be Pakistan will be forced to stop exporting terror into India.

This is too small a place to answer this. But I will make an attempt.

The problem is Pakistan wanted to annex Kashmir in 1948 as it happened to be a Muslim-ruled monarchy ruled by a Hindu king till our independence from British rule. They thought that the division of India was not proper. Kashmir happens to be a bordering state and geographically a very important location bordering Pakistan and China. They failed in their first attempt. Then the 1965, 1971 and 1999 wars which they lost. The attempts continued. Kargil happened. China has become their closest ally. They have given 5000 sq.km. of land they were occupying to China to build the Karakoram highway in 1963. You can drive from Beijing to Islamabad without anyone knowing. That highway is hidden from the world. Now Pakistan has maintained the policy of bleeding India through a war with a thousand cuts.