I was previously a student in Ireland for a period of nine years. After my tuition I left voluntarily after the expiration of my visa to my home country of Nigeria. On applying for a UK student visa recently, which was refused, I learnt that after I had vacated Ireland, a deportation order was sent to my old address which formed the basis of my UK visa refusal. This order was served on my old address in Ireland a year after I had left the country. I showed evidence on my UK visa appeal that I was not present in Ireland at the time such order was claimed to have been served on me, but I was still refused.
I now proceeded to apply for an Irish tourist visa, this was also refused on the grounds that I had previously been served with a deportation order. On appeal and after producing evidence, my appeal was now denied stating that I had previously overstayed and I attached no proof of returning to my home country at the expiration of my visa (even though I had attached a letter from my employer). I wish to apply for an Irish visa again in order to visit old friends on my leave.
I would like advice on how long after my refusal can I apply and how to tackle the issue arising which led to my previous refusals.