HTTP/HTTPS to secondary node is not supported - ref https://kb.juniper.net/KB16827
Regarding SSH, can you try adding a specific /32 back-up route for the source from where you are trying to do SSH,
set groups node1 system backup-router destination x.x.x.x/32
More troubleshooting steps on https://kb.juniper.net/KB21113
Regarding SSH, can you try adding a specific /32 back-up route for the source from where you are trying to do SSH,
set groups node1 system backup-router destination x.x.x.x/32
More troubleshooting steps on https://kb.juniper.net/KB21113