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Check access to update.fortiguard.net
with commands below:
nc -vz update.fortiguard.net 443
curl --insecure https://update.fortiguard.net
The correct output will look like the following:
[root@fortisiem-super ~]# nc -vz update.fortiguard.net 443
Ncat: Version 7.70 ( https://nmap.org/ncat )
Ncat: Connected to 173.243.138.67:443.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.
[root@fortisiem-super ~]# curl --insecure https://update.fortiguard.net
curl: (52) Empty reply from server
Try multiple times and make sure there are no errors like those below or any others.
curl: (56) OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 104
(This particular error simply means the other side hung up, without completing the normal HTTPS protocol. It is likely that the server is not available).
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