I have upgraded Magento 22.214.171.124 to Magento 126.96.36.199. After this I am not able to reindex "Catalog URL Rewrites" index while all other index are working fine (I am able to index them).
I am getting error 505 error: "Request Timeout This request takes too long to process, it is timed out by the server. If it should not be timed out, please contact administrator of this web site to increase 'Connection Timeout'."
Also I am not able to get this error info in any log files. Also I have no SSH access.
I have upgraded the website in localhost and then move files only to live server today. Website is working fine but as reindexing is one of the most important step so I am not able to do this and its causing some other issue in backend.