# General Issues ## **Can’t log in** **What could be the reason:** * wrong email address * the password is incorrect * the user with the specified email address is not registered in the system **What’s the solution:** * specify correct email address * be sure to type the correct password * reset password * check the specified email inbox to be sure it's registered in the system * register with a different email address ## **No email received** **What could be the reason:** * you entered an incorrect email address * the letter got into the spam folder * email server issues **What’s the solution:** * specify correct email address * check your spam folder * contact you mail server administrator ## **No connection to server** **What could be the reason:** * you do not have an internet connection * the server is rebooting * intermediate providers issues **What’s the solution:** * check your internet connection * you should wait for a while to reboot the server * run traceroute command in your OS terminal, contact your ISP and provide them with this data ## I can't see all metadata in Blynk.Apps **What could be the reason:** * not all metadata can be viewed now due to it's not implemented yet **What’s the solution:** * view full metadata list in Blynk.Console * wait for Blynk.Apps full metadata support and update Blynk.Apps regularly ## Device is offline **What could be the reason:** * connectivity issues * auth token was changed * Wi-Fi network SSID or password was changed * old version of library or even beta version is used * outdated ESP core version **What’s the solution:** * check if the device is powered on * check your internet connection between the device and Blynk.Cloud (mind Wi-Fi signal strength and distance) * connect to your device and check if it's auth token matches one in Blynk.Cloud * be sure to use the latest version of library, otherwise re-flash and launch Device Reprovision process * check your ESP core version is up to date, otherwise re-flash and launch Device Reprovision process ## "Not correct device" during add device **What could be the reason:** * device board hardware is not supported by the Template * device Template ID mismatch * wrong Template Name **What’s the solution:** * be sure to use the hardware that is mentioned in Template's Info page * be sure you paste correct BLYNK\_TEMPLATE\_ID to the sketch * be sure you paste correct BLYNK\_TEMPLATE\_NAME to the sketch ## I can't erase data from a device **What could be the reason:** * some time is required to erase all device data * there was network disconnection during the command send **What’s the solution:** * wait for up to 5 minutes and re-check device's data * check your network connection, re-send the command ## There are no devices in Blynk.Apps [Automation](/en/concepts/automations.md) **What could be the reason:** * there are no templates you can use at the moment * there are no devices added and available to access * device template has no datastreams allowed for automations **What’s the solution:** * create a template or ask your organization admin for it * add a device so you can access it from Devices tab * check for the template to have required datastreams are exposed to automations ## I press button or move slider and nothing happens to the device **What could be the reason:** * connectivity issues * device issues **What’s the solution:** * check your internet connection for both: device and smartphone/PC (Blynk is a cloud platform, there's no offline support) * be sure that device is powered on and has no circuit or physical damage ## I can't download device report **What could be the reason:** * connectivity issues * no data for the selected device * you have no permissions to do that **What’s the solution:** * check your internet connection * no report can be provided for download if there's no data for it * contact your organization administrator ## My hardware constantly disconnected There are multiple reasons why your hardware could be disconnected. In order to eliminate some obvious reasons, please do the next: * Run `ping blynk.cloud`. If your connection is good you should see the ping less than 200ms. If you see the higher ping it could be a reason for disconnections * In case your hardware uses Wi-Fi - check your Wi-Fi signal strength, and make sure there is no other noise that case decrease the signal level * Make sure you don't use `delay()` instructions in your firmware, long delay in your sketch can break the persistent connection with Blynk Cloud * Checkout your serial console output, make sure it doesn't contain crashes or other error that may lead to connection interrupts * Make sure you don't send a huge number of virtualWrite commands per seconds. Blynk Cloud doesn't allow to send more than 20 requests per seconds. 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