IT problems & symptoms
What problem are you facing? Search real-world IT problems, then open the structured checks, likely causes and technician view.
Wi-Fi connected but no Internet access
The computer is connected to the Wi-Fi network, but Internet access and web browsing do not work.
NetworkThe PC gets a 169.254.x.x address
Windows assigns itself an APIPA address when it cannot obtain a network configuration from DHCP.
NetworkPing works but the website or service remains inaccessible
The remote host responds to ping, but the expected application, service or port cannot be reached.
DNSA server name does not resolve, but its IP address works
Access by IP address works, but DNS name resolution fails.
VPN & FortiGateThe VPN connects, but internal servers are unreachable
The VPN client shows as connected, but internal resources do not respond.
VPN & FortiGateThe VPN no longer connects
The VPN client fails before the tunnel or remote-access session is established.
Active DirectoryCannot sign in to the Windows domain
A user can no longer sign in with their domain account.
Active DirectoryTrust relationship between this workstation and the domain failed
Distinguish DNS or network failures from a broken secure channel, repair a domain member’s trust relationship, and verify the result.
Active DirectoryA GPO is not applying to a workstation
An expected Group Policy is not being applied to a user or computer.
WindowsThe Windows PC is very slow
The computer takes a long time to start, open applications or respond to user actions.
WindowsThe C: drive is almost full
The Windows system volume is running low on free space and may disrupt updates and applications.
WindowsWindows Update keeps failing
Windows updates download or begin installing, then fail repeatedly.
EmailOutlook keeps asking for the password
Outlook repeatedly prompts for credentials even after the password is entered.
EmailOutlook is extremely slow
Outlook takes several seconds to open messages, switch folders or run a search.
EmailAn email is stuck in the Outbox
A message remains in the mail client's Outbox and is not sent.
EmailSMTP 550 Sender mismatch error
The SMTP server rejects the message because the sender address is not permitted for the authenticated account.
EmailEmails are landing in spam
Messages sent by the domain are frequently classified as junk or spam.
WordPressWordPress displays “There has been a critical error on this website”
WordPress encounters a fatal PHP error and can no longer display a page or the administration area normally.
WordPressWordPress returns an HTTP 500 error
The server returns HTTP 500 when the WordPress site is accessed.
WordPressWordPress is stuck in a too-many-redirects loop
The browser reports ERR_TOO_MANY_REDIRECTS or an endless redirect loop.
WordPressWordPress can no longer connect to the database
WordPress displays an “Error establishing a database connection” message.
BackupA backup fails with a VSS error
Windows backup software fails while creating a VSS snapshot.
BackupThe backup works but is unusually slow
The backup task completes or progresses, but now takes much longer than usual.
VirtualizationA VM no longer starts after a snapshot issue
A virtual machine refuses to start after a snapshot error or inconsistency.
VirtualizationA VMware datastore is almost full
The storage hosting the virtual machines is approaching its maximum capacity.
WindowsRDP no longer works to a Windows server
The Remote Desktop connection to a Windows server or workstation fails.
PeripheralsA network printer is offline
Windows reports the network printer as offline, or print jobs remain queued.
PeripheralsScan to network folder no longer works
A multifunction printer can no longer save scans to an SMB network share.
DNSThe DNS server returns SERVFAIL
The DNS resolver returns SERVFAIL instead of an answer or NXDOMAIN.
WebA website returns 502 Bad Gateway
The proxy or front-end server cannot obtain a valid response from the upstream application server.
WebA website returns 503 Service Unavailable
The web service is temporarily unavailable or is refusing new requests.
Web & SecurityThe HTTPS certificate has expired
Browsers report that the website's TLS certificate is no longer valid.
Cloud & Microsoft 365A Microsoft 365 account can no longer sign in
A user can no longer authenticate to Microsoft 365.
Cloud & Microsoft 365OneDrive no longer syncs
Files remain pending or display OneDrive synchronization errors.
NetworkA network share suddenly asks for credentials
An SMB share that previously opened transparently now prompts for a username and password.