PS 1.6: can't access backend or add products with php 5.6 (or above)

[beepow]

Hello everybody,
I have a PS 1.6.1.14 running on a server with php 5.5.38 (Default theme).
If I try to change it to 5.6 (or 7.0) the site still appears but products cannot be added to cart.
There is no error on screen or in chrome console: you click and nothig happens.
Same thing for backend login: the page simply reoloads without errors but you can't access until php version is > 5.5.38
I've tried cleaning cookies and I've changed browser. With also incognito mode on.
Loggin in as user still works instead.

Any suggestion would be appreciated...
 

[beepow]

UPDATE:
If I change PS_CIPHER_ALGORITHM value from 1 to 0 in ps_configuration table it works.
But I guess it could be not the right thing to do (for security reasons at least)

Edited September 26, 2022 by beepow (see edit history)

[PrestaServicePro]

Hello, 

it seems changing php version some extension disabled or php.ini configs not compatible.

I attached files and add it to root and open this from url.

https://your.com/phppsinfo.php

then change php version to 5.6 or 7.1

after, open this url https://your.com/phppsinfo.php again and you will see disabled or enabled extensions.

then apply disabled one to server.

clear cache and try again.

maybe this way can help you.

good day 

phppsinfo.php.zip

[beepow]

Thanks PrestaServicePro!!
it seems really interesting: I'll dig it!
B.


(by the way, I would like to know if changing PS_CIPHER_ALGORITHM could weak the security on site)

[beepow]

27 minutes ago, PrestaServicePro said:

then apply disabled one to server.

Do you mean that I must reactivate them?
Or I have to ask for help from my Server?

[PrestaServicePro]

(by the way, I would like to know if changing PS_CIPHER_ALGORITHM could weak the security on site)
 RE: don’t touch or change any file.

Just follow our above explained steps.

after following our solution if the problem persists then contact the host and ask if something is disabled in the server.

[PrestaServicePro]

2 minutes ago, beepow said:

Do you mean that I must reactivate them?
Or I have to ask for help from my Server?

yes you can ask to your host 

[beepow]

I've run the test and the only "red" cells are for the following directories (which are not writable):

app/config
app/Resources/translations
var/cache
var/logs

But I guess they belong to PS 1.7 versions, so this should be not a problem.
All the other checks are the same...

thanks