I discussed about certificates in 10g WebGate expiry after 365 days and fix is to re-configure WebGate that will generate new certificate for one year (To change duration of certificate update default_days in $WEBGATE_HOME/oblix/tools/openssl/ openssl.cnf )
Certificates for WebGates are stored in file with PEM extension. You can open PEM file to view validity of certificate using opensssl as shown below
openssl x509 -in aaa_cert.pem -noout -text
where aaa_cert.pem is the file where certificate is stored.
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