Choose the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.  I haven’t finished my work because there was a fault in the network and I couldn’t log on

Choose the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

 I haven’t finished my work because there was a fault in the network and I couldn’t log on until 4 o’clock.