Lan cannot communicate after setting ip manually

Hello, gods, there are two computers An and B in the local area network. Their ip addresses are 192.168.1.105 and 192.168.1.104 respectively. At this time, the two computers can ping each other, but I set the ip address of computer B to fixed ip (manually set to 192.168.1.104). At this time, the two computers cannot communicate with each other on ping. May I ask why? Thank you!

the following is the network connection information of the two computers that ping is not available:

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Jan.10,2022
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3fa91-2c4b5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3fa91-2c4b5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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