Your rig could be offline due to many reasons:
First please check if your rigs are still mining in pool.
If yes then your rigs just have problem connecting with simplemining.net and they will appear as OFFLINE in dashboard.
Most common problems are:
1. Local internet or power proglem - check if your rigs have power and internet connection
2. Rigs can crash/freeze and be unable to work, reboot rig to see if that helps
3. DNS problem - sometimes DNS you are using can cause problems like that.
First try to chang DNS in your router to most stable Cloudflare DNS servers: 1.1.1.1 and 1.0.0.1
After that, please reboot your router and after that reboot also your rigs and see if that fixed your issue.
4. If rig is mining in pool and it is offline in simplemining then also usb drive can be corrupted or broken (try other osb drive)
5. If problem still persist then please check cloudflare anti DDoS service if they have curently any problems
https://www.cloudflarestatus.com/
If they have curently some problems then most common they will fix it within 2 hours.
6. If the problem is still there then you can check if you are not blocked by cloudflare due to suspicious activity from your internet provider.
If nothing above helped, please contact our support.
Also it is good to plug in LCD monitor and reboot rig and see what is going on.

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A simple to install and setup tool. Download and install our software and your farm infrastructure will automatically detect your mining rigs and add them to your management dashboard

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Register Account
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Download OS and register
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Flash it to USB/HDD/SSD
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Select miner and settings
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Monitor your rigs
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You can see all your RIGS in one dashboard, monitor hash rates, online status, GPU errors, reboot, reload, manage group, pools. Overclock AMD RX 4xx/ RX5xx and Nvidia GPUs from the web. Based on Ubuntu Server 16.04.
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v0.5Xmr-stak
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v8.22CuBalloon
v1.0.2
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Reboot on Failure

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Data center guarantees trouble-free operation of your equipment, control and monitoring for optimal external temperature protection.
Data center is protected from electric voltage jumps and broken internet connections. Backuping of power supply systems provides hours-long stable functioning of equipment in case if some force-majeure circumstances occurs (instability of electric power network, industrial network disconnection etc.). a duty engineer proceeds to remove defects/failures at once after relevant information is received.
FAQ
Have any questions?
All my rigs are offline ?
Can i mix AMD and NVIDIA gpus in one rig ?
The answer is NO you cannot mix them in ONE rig.
In one rig there needs to be either AMD only or Nvidia only.
AMD has different overclocking schema which is not compatible with NVIDIA.
Problem booting OS ? Recommended motherboard bios options.
1) Make sure you are running the latest BIOS! (you can also try older ones if newest isn't working)
2) Set device to boot from USB/pendrive !
3) Disable Sound audio card !
4) Enable 4G encode !
5) Set PCIe support to Auto or GEN2 !
6) Enable onboard graphics to default (PEG - > IDG)
7) Set also: power ON on AC power lost, disable virtualisation
8) Plug your monitor into the ONBOARD graphics if you want to take a look on boot process
TB250-BTC
:
use this bios firmware version because other cause problems: B25CF330.BSS
Bios-Chipset-mining mode-Above 6x VGA
Bios-Chipset-PCIO Config- PCI Express Config - GEN 2(or maybe Auto)
Bios-Chipset-PCIO Config-HD Audio -disabled
Bios-Chipset-System Agent configuration - Internal Graphic- IGFX
Bios-Chipset-System Agent configuration - Primary Display - Onboard
Bios-Chipset-System Agent configuration - VT-D - Enabled
Bios-Chipset-System Agent configuration - Above 4G - Enabled
Bios-Chipset-System Agent configuration - PEX 16_1 - Gen 2(or Auto)
Bios-Boot-Boot option filter - Legacy only
Bios-Boot-Storage-Legacy
Bios-Boot-Option #1 - Your SSD legacy
Bios-Security-Secure boot - disabled
Asrock h110 pro BTC (
installing your GPUs, make sure you have filled all black PCI-E slots first, before plugging your risers into a white slot)
Bios - Advanced - Chipset configuration - Primary Graphic Adapter - ONBOARD
Bios - Advanced - Chipset configuration - Above 4gb - Enabled
Bios - Advanced - Chipset configuration - Pci link speed - GEN 2(7 times)
Bios - Advanced - Chipset configuration - Audio - Disabled
Bios - Advanced - Chipset configuration - Onboard HDMI HD Audio - Disabled
Bios - Advanced - Chipset configuration - Restore AC power loss - Power ON
Asus B250 mining expert
( this motherboard is a leader by the number of reported issues. Keep that in mind )
Tool - EzFlash - Update bios online
Boot - Fast boot - disabled
Boot - Next boot after AC Power loss - Normal boot
Boot - Secure boot - disabled(legacy)
Advanced - mining mode - Enabled
Advanced - Post slot detection time - 10 sec
Advanced - System agent Config - Primary Display - CPU
Advanced - System agent Config - DMI/OPI conf - GEN 2
Advanced - System agent Config - PEG port conf - GEN 2
Advanced - PCH Config - PCI express config - GEN 2
Advanced - Onboard devices config - HD Audio controller - Disabled
Advanced - APM config - Restore AC Power Loss - Power ON
Z270-P : please plug in pendrive in USB 2.0 (if you have problems with your rig)
If you still have problem booting when pendrive is in blue USB 3.0, please try plugging it into black USB 2.0 also.
Also if you still have problem, try redownloading image and reflashing it again to USB (maybe it get corrupted while downloading).
If that will not help, try using other pendrive - sometimes pendrives just broke.
Why my rig is crashing freezing too much ?
Most common cases:
1. Too much overclocking or undervolting (or custom bios with bad settings)
Lower your overclocking a lot and check if it will help.
If you have custom bios then check if flashing original will fix the problem.
If you have powerstage level in overclock menu set to 6, try chaning it to 7.
2. Bad riser
Low quality risers are very common in causing many problems.
Change riser or use better ones and see if that will help.
Try checking one by one GPU to see if maybe only one is causing problems.
3. Too weak Power supply can cause that rig will reboot or shutdown.
Also too high temperature in room can cause that power supply will just shut off.
For example some Corsair Power supplies can shut down itself if temperature is bigger than 39°C.
What is No screen atached error?
This error is very common and it can be related to
1. No gpu can be found by your system
To check how many cards your system found press CTRL-C while the error is being displayed and type:
lspci | grep VGA
If it only shows the integrated gpu from your cpu then your system can't find your mining GPU. Please check cables, riser, power etc.
2. Internet is very slow or does not work at all and the mining process cannot start.
GPU has fallen off the bus
This message occurs mostly in nvidia GPUs when:
- you have entered too much overclock values. Try lower ones like core: 10 and mem: 10 for testing
- riser or risers are broken
- there is problem with Power supply that makes setup unstable

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Data center guarantees trouble-free operation of your equipment, control and monitoring for optimal external temperature protection.