Steps to fix the error: Cannot login to Horde Webmail (Plesk): Login Failed
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PROBLEM:
While Login into Webmail it returns the error: “Login failed”
SOLUTION:
Make sure that it is possible to connect to localhost:143 from the command line using telnet. If you get the error as below:
# telnet localhost 143 localhost/143: Name or service not known
then check /etc/hosts file. It must have permissions -rw-r–r– and contain the record for localhost in the following format:
127.0.0.1 localhost localhost.localdomain
Above is from From Parallels Knowledgebase
If /var/log/psa-horde/psa-horde.log shows something like:
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