Issue Protocol version '1.6.5.0' is deprecated. Current protocol version is '1.6.9.1'.

[mikelino]

Server operating system version

linux centos

Plesk version and microupdate number

Plesk Obsidian

Access plesk control panel only via mobile app, via browser i have error "ERR_CONNECTION_TIMED_OUT". Also panel error logs i found this massage many times "Protocol version '1.6.5.0' is deprecated. Current protocol version is '1.6.9.1'.

 

[IgorG]

Access plesk control panel only via mobile app, via browser i have error "ERR_CONNECTION_TIMED_OUT"

Please check this KB article: https://support.plesk.com/hc/en-us/...e-on-ports-8443-8880-ERR-CONNECTION-TIMED-OUT

Also panel error logs i found this massage many times "Protocol version '1.6.5.0' is deprecated. Current protocol version is '1.6.9.1'.

These messages are caused by the external API trying to reach Plesk using an old version of XML API protocol.
These warning messages can be safely ignored.

 

[King555]

These messages are caused by the external API trying to reach Plesk using an old version of XML API protocol.
These warning messages can be safely ignored.

I also have this message ("Protocol version '1.6.5.0' is deprecated. Current protocol version is '1.6.9.1'."). It spams my Plesk log file and makes the log file useless (because I cannot find "real" entries). What does "external API" mean in this case? Is it the Plesk mobile app? I use it rarely, but I have it installed on my phone.

 

[Peter Debik]

When you have the API enabled, everyone can try to access your server through the Plesk API. This is not limited to the Plesk Mobile App. If you are not using the App, neither need this API functionality, I recommend to turn the API off completely with this setting in panel.ini:

[api]
enabled = off

There is not really much that the app does that you cannot also do through the (responsive) web interface on your phone.

 

[King555]

My Plesk runs on a special port and I doubt that there are requests, especially API request, to my Plesk installation. I will disable the app to find out whether it's the problem. Could it also be an extension within Plesk, which makes these API calls?

 

[Kaspar]

Some external services use the API too. Like WHMCS and Plesk 360 (only if you've added your server to Plesk 360 of course). Extension can use the API too, but I don't think many do.

 

[King555]

I stopped the Plesk app on my phone (Android) two days ago and the message in the log is gone. So it was only this app all the time. But why? Is the app not maintained anymore?

 

[Peter Debik]

A similar case has recently been reported to support. It will be checked what can be done about the app.

Until then, a suggestion to suppress the warnings is to add

deprecationWarning = off

to the [api] section of panel.ini.

 

[King555]

Two more years have passed and the app still produces this message. Are there any plans to update the app? I use the latest versions of Ubuntu, Plesk and the app.

 

[Sebahat.hadzhi]

As far as I am aware, the deprecationWarning logging is by default switched off. Hence, unless you have manually enabled it, such warning should not be logged. Please double-check the panel.ini file and confirm whether it is set to off or on. There are currently no plans to completely exclude logging such warnings when an older protocol is used.

Are there any plans to update the app?

Would you mind clarifying this question? The warnings about deprecated protocol version are produced upon external XML requests, not due to requests performed by Plesk.

 

[King555]

the deprecationWarning logging is by default switched off

I just checked, the value has never been explicitly set (quite fresh Plesk installation), but according to the extension "Panel.ini Editor" the default value is "true". I will set this to "false" now manually.

BUT:

The warnings about deprecated protocol version are produced upon external XML requests

In my case the warnings are solely produced by the official Plesk app (Android), that's the only usage of the Plesk API on my server. So the question is when will the app be updated concerning this.

 

[Sebahat.hadzhi]

In my case the warnings are solely produced by the official Plesk app (Android), that's the only usage of the Plesk API on my server. So the question is when will the app be updated concerning this.

Could you please provide the logs in reference so I can review them and discuss the matter further with our team? Thank you in advance.

 

[King555]

I checked all log files I could find concerning this issue. The following files show these messages every minute (and that 24/7):

/var/log/plesk/panel.log

[2025-03-24 17:46:15.919] 293560:67e18c57df269 ERR [panel] Protocol version '1.6.5.0' is deprecated. Current protocol version is '1.6.9.1'.
[2025-03-24 17:46:15.919] 293561:67e18c57defc8 ERR [panel] Protocol version '1.6.5.0' is deprecated. Current protocol version is '1.6.9.1'.

/var/log/plesk/httpsd_access_log

0.0.0.0 - - [24/Mar/2025:17:46:16 +0100] "POST /modules/plesk-mobile/public/index.php?id=info HTTP/1.1" 200 165 "-" "Dalvik/2.1.0 (Linux; U; Android 9; SM-G955F Build/PPR1.180610.011)" "-"'/modules/plesk-mobile/public/index.php' '' '/opt/psa/admin/htdocs'
0.0.0.0 - - [24/Mar/2025:17:45:16 +0100] "POST /modules/plesk-mobile/public/index.php?id=mob_1.2.1 HTTP/1.1" 200 2510 "-" "Dalvik/2.1.0 (Linux; U; Android 9; SM-G955F Build/PPR1.180610.011)" "-"'/modules/plesk-mobile/public/index.php' '' '/opt/psa/admin/htdocs'

0.0.0.0 = anonymized IP of my phone.

 

[Sebahat.hadzhi]

Thank you for the update and the additional details. I discussed the case further with our team and the warning could indeed be caused by the Mobile app due to a bug. It is not considered as functional issue and it can be safely ignored. We have an internal case for it. However, I cannot provide any confirmation on when a fix will be released. For the time being, please keep deprecationWarning set to off.