R studio 导入网页数据问题

R 小白，之前导入都没有出现这种情况，个人感觉是因为前几天用了一个vpn可能吧网络设置给弄不正常了，但具体怎么弄不太情况，望高人指点。

R code:
url="https://mcs.utm.utoronto.ca/~nosedal/data/thermostat.txt%22
thermostat=read.table(file=url, header=TRUE);

出现的问题：
Error in file(file, "rt") :
cannot open the connection to 'https://mcs.utm.utoronto.ca/~nosedal/data/thermostat.txt'
此外: Warning message:
In file(file, "rt") :
URL 'https://mcs.utm.utoronto.ca/~nosedal/data/thermostat.txt': status was 'Peer certificate cannot be authenticated with given CA certificates'

img