In HOSTINGER, they use a robot validation script, which blocks MainWP from detecting a child target site
This site can not be reached! Please use the Test Connection feature and see if the positive response will be returned. For additional help, contact the MainWP Support.
Connection test failed.
Error message: Failed to connect to reinventandoelmundo.org port 443 after 50 ms: Connection refused
On client site, I went to server tab and all show PASS except SSL which shows “error:0607A082:digital envelope routines:EVP_CIPHER_CTX_set_key_length:invalid key length Warning”
In these situaations it’s usually easily fixed by adding your MainWP I.P. Server address to the Child Sites Whitelist.
Can you please post the community system report from your MainWP Dashboard for review? The report is located in your Dashboard under Status → Server, on the top right of the page.
Be sure to use the button like the one below; this button hides all your private information:
Pressing the button auto-copies the report to your clipboard then just paste it in a reply here.