Error message imap.gmail.com is not responding - How we sort it out
IMAP Error: Login failed for
Roundcube stoped working "Connection to imap server failed" | Plesk Forum
Install and secure a complete mail server (Mail, SMTP, Auth by SASL, IMAP, POP3, webmail, TLS and SSL) on Debian - Linux - Tutorials - InformatiWeb Pro
RoundCube Configuration - QNAPedia
Unable to login to email via IMAP: Connection to storage server failed: process_limit reached - Support Cases from Plesk Knowledge Base
How to fix SMTP Error (-1): Connection to server failed in RoundCube? - Knowledgebase - AccuWebHosting
1.3.10, Doesn't list INBOX, seems to drop user password and logout from imap. · Issue #6916 · roundcube/roundcubemail · GitHub
Roundcube: Connection to storage server failed. · Issue #297 · sovereign/sovereign · GitHub