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Every now and then I get the "zlibinstream:exceeded bytesIn" error when trying to connect to my server through my vnc. Why do I get this error and how can I solve it when I get it - without restarting my server ?

Homonym answered 2/11, 2014 at 7:43 Comment(0)

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Came across the same issue a couple of times. I am not aware of permanent fix, but for a quick one just change colour to Fullcolour.

For me in VNC Viewer it was in options/Expert/FullColour to true.

Vichyssoise answered 31/12, 2014 at 10:28 Comment(4)

Turning FullColour to true fixed it for me too. As a test, I tried turning FullColour back to false and the problem came back. Strange that this problem just started today after 1.5 years of exactly the same usage. – Reeding 9/7, 2015 at 20:33

Ack, maybe not. The problem just came back (22 days later) and FullColour is still true. – Reeding 31/7, 2015 at 8:48

While I can't definitively say this is the cause, we have just upgraded Cisco AnyConnect VPN client from 3.x to 4.1.08005 and I am noticing this error for the first time. As you say, changing the colour settings seems to have made it go away for now. thanks – Theorist 2/12, 2015 at 7:33

funnily changing FullColour to "False" did it for me. So I'm not really sure, if this has anything to do with it. – Becca 17/7, 2023 at 11:49

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Another quick fix (for Mac):

Reading the other responses and trying out a few, I feel toggling random Properties/Options will "solve" this problem. Do the following for Real VNC on Mac:

Options -> Picture Quality -> High. Then Set it back to Automatic.

Robichaud answered 17/3, 2017 at 18:31 Comment(2)

saved my day! Not sure, why there is no real fix for this issue yet! – Parisian 27/6, 2017 at 10:5

I made this fix on the fly and viewer is back. Let see if works permanently! – Savour 26/7, 2017 at 19:56

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In my case the solutions is just to change quality to Low. Seems to work fine.

Callum answered 5/4, 2017 at 15:37 Comment(1)

This worked for me, did you ever find a more permanent fix? I'd rather the picture quality not stay low...Edit: Actually, I changed it back to high or automatic or anything, it seems to still work. How strange. – Logistics 6/11, 2017 at 21:31

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What worked for me was to turn off "Adapt to network speed (recommended)" (under Options->Display) and then move the compression slider to the left from "All available colors, medium compression" to "Hundreds of colors".

Prior to this, Burpy Burp's answer of changing options/Expert/FullColour to true temporarily fixed the problem but it came back 22 days later.

Reeding answered 31/7, 2015 at 8:59 Comment(1)

Even this failed eventually. I had to change it back from "Hundreds of colors" to "All available colors, max compression". It seems like every once in a while it's necessary to force a mode change in order to work around this issue. The start/end mode is unimportant. – Reeding 12/9, 2016 at 17:17

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This seems to be related with timing. On my mac, I'm having the same issue and usually waiting for a while and retrying is the only thing that works for me. It always comes back but not an immediate solution.

Dinin answered 10/12, 2014 at 2:15 Comment(0)

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Color level Full didnt resolve the issue but when set Options-Picture Quality High instead of Automatic resolved.

Dispensable answered 18/4, 2018 at 6:27 Comment(0)

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Just for the googlers out there that find this question: Changing the "prefered encoding" to something other than "ZRLE" (I used "hextile")is what solved the issue for me.

Georg answered 14/5, 2015 at 16:4 Comment(0)

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Opening the options dialog without changing anything did it for me. Baffled.

Titration answered 1/5, 2015 at 4:51 Comment(0)

Another quick fix (for Mac):

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