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Zero sized reply squid error in Horde – How we resolve it

by | Feb 4, 2021

Are you looking for a solution for your webmail error ‘Zero sized reply squid error in Horde’? We can help you fix it.

Many of our customers approached us with this error message while trying to log in to Horde webmail. This error was seen after upgrading the Plesk version.

Here at Bobcares, we have seen several such Webmail related errors as part of our Server Management Services for web hosts and online service providers.

Today we will see what causes this error to occur and also let’s see how our Support Engineers fix this error for our customers.


What causes ‘Zero sized reply squid error’ to occur

Before we get into the solution part of this error message, let us first see what causes this error to arise.

Generally, this error message appears when trying to log into the Horde webmail. It shows an error that the login has failed due to a bad user name or password and it might end with the error message “Zero sized reply squid error”.

This happens after upgrading the Plesk version.

Also, some webmail Horde functionality may be broken (for example address book, calendar).

The cause of the problem is new horde system is trying to connect to localhost via the host’s file.


How we resolve ‘Zero sized reply squid error in Horde’

One of our customers upgraded the Plesk version. Then he was not able to access the webmail and was receiving ‘Zero sized reply squid error’

Now let’s take a look at how our Support Engineers resolve this error message.

The issue can be fixed following the below steps :

We tried to disable the Zend memory manager. In order to do this, we set the USE_ZEND_ALLOC environment variable to 0.

echo “export USE_ZEND_ALLOC=0”

Then we restarted Apache by running the below command.

service httpd restart

If this doesn’t work for you then try to disable ionCube.

[Need any further assistance in fixing webmail errors? – We can help you]



Generally, this kind of error occurs in webmail in Plesk after the upgrade of the Plesk version. Today, we saw how our Support Engineers fix this ‘Zero sized reply squid error’ in Horde by making changes to the system configuration file of Apache.


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